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MARKETABLE SECURITIES - Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Amortized Cost	$ 151.6	$ 156.5
Pre-Tax Unrealized Gains	1.7	0.7
Pre-Tax Unrealized Losses	(1.4)	(1.8)
Fair Value	$ 151.9	$ 155.4

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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+ Details

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, and Equipment

The following tables summarize property, plant and equipment by asset category:


Eversource	As of March 31, 2026		As of December 31, 2025
(Millions of Dollars)
Distribution - Electric	$	23,108.6	$	22,695.3
Distribution - Natural Gas	9,899.0		9,888.0
Transmission - Electric	17,181.8		17,082.4
Distribution - Water	2,608.3		2,577.3
Solar	206.8		206.8
Utility	53,004.5		52,449.8
Other (1)	2,532.6		2,476.3
Property, Plant and Equipment, Gross	55,537.1		54,926.1
Less: Accumulated Depreciation
Utility	(11,114.0)		(10,911.7)
Other	(1,303.9)		(1,246.1)
Total Accumulated Depreciation	(12,417.9)		(12,157.8)
Property, Plant and Equipment, Net	43,119.2		42,768.3
Construction Work in Progress	3,351.0		3,162.7
Total Property, Plant and Equipment, Net	$	46,470.2	$	45,931.0

(1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.


	As of March 31, 2026						As of December 31, 2025
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	9,038.7	$	10,870.2	$	3,239.9	$	8,906.0	$	10,635.7	$	3,193.8
Transmission - Electric	7,263.7		6,749.2		3,170.6		7,222.5		6,722.9		3,138.7
Solar	—		206.8		—		—		206.8		—
Property, Plant and Equipment, Gross	16,302.4		17,826.2		6,410.5		16,128.5		17,565.4		6,332.5
Less: Accumulated Depreciation	(3,140.8)		(4,088.0)		(1,105.2)		(3,081.3)		(4,014.2)		(1,085.4)
Property, Plant and Equipment, Net	13,161.6		13,738.2		5,305.3		13,047.2		13,551.2		5,247.1
Construction Work in Progress	606.4		1,831.2		264.4		576.1		1,757.7		260.6
Total Property, Plant and Equipment, Net	$	13,768.0	$	15,569.4	$	5,569.7	$	13,623.3	$	15,308.9	$	5,507.7

EARNINGS PER SHARE - Components of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net Income Attributable to Common Shareholders	$ 606,841	$ 550,788
Weighted Average Common Shares Outstanding:
Basic (in shares)	376,026,090	367,320,246
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]
Dilutive Effect (in shares)	557,524	357,372
Diluted (in shares)	376,583,614	367,677,618
Basic Earnings Per Common Share (in dollars per share)	$ 1.61	$ 1.50
Diluted Earnings Per Common Share (in dollars per share)	$ 1.61	$ 1.50

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

+ References

+ Details

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash	$ 270,184	$ 135,351
Receivables, Net (net of allowance for uncollectible accounts)	2,080,805	1,847,094
Unbilled Revenues	217,605	275,108
Materials and Supplies	489,415	491,592
Regulatory Assets	1,897,191	1,975,083
Prepayments and Other Current Assets	389,535	352,958
Total Current Assets	5,344,735	5,077,186
Property, Plant and Equipment, Net	46,470,244	45,930,959
Deferred Debits and Other Assets:
Regulatory Assets	5,768,159	5,718,646
Prepaid Pension and PBOP	1,566,418	1,511,169
Other Long-Term Assets	1,002,089	997,883
Total Deferred Debits and Other Assets	12,892,622	12,778,566
Total Assets	64,707,601	63,786,711
Current Liabilities:
Long-Term Debt – Current Portion	2,643,097	1,392,948
Accounts Payable	1,662,046	1,859,692
Regulatory Liabilities	1,739,987	1,264,609
Other Current Liabilities	1,290,226	1,274,450
Total Current Liabilities	8,209,723	7,808,512
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,894,583	5,647,218
Regulatory Liabilities	4,323,619	4,273,465
Other Long-Term Liabilities	1,138,347	1,101,932
Total Deferred Credits and Other Liabilities	12,690,972	12,472,065
Long-Term Debt	26,861,131	26,872,433
Preferred Stock Not Subject to Mandatory Redemption	155,568	155,568
Common Shareholders' Equity:
Capital Surplus, Paid In	9,950,113	9,937,878
Retained Earnings	4,815,846	4,504,983
Accumulated Other Comprehensive Income (Loss)	(20,377)	(20,507)
Common Shareholders' Equity	16,530,950	16,197,271
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	64,707,601	63,786,711
The Connecticut Light and Power Company
Current Assets:
Cash	13,047	87,615
Unbilled Revenues	54,943	63,508
Materials and Supplies	129,838	133,908
Regulatory Assets	235,015	265,175
Prepayments and Other Current Assets	70,386	50,579
Total Current Assets	1,282,512	1,313,930
Property, Plant and Equipment, Net	13,768,014	13,623,296
Deferred Debits and Other Assets:
Regulatory Assets	1,750,400	1,716,212
Prepaid Pension and PBOP	212,999	204,067
Other Long-Term Assets	311,900	321,234
Total Deferred Debits and Other Assets	2,275,299	2,241,513
Total Assets	17,325,825	17,178,739
Current Liabilities:
Notes Payable to Eversource Parent	39,000	0
Long-Term Debt – Current Portion	500,000	0
Accrued Taxes	84,727	165,362
Regulatory Liabilities	635,307	417,498
Other Current Liabilities	181,964	220,592
Total Current Liabilities	2,159,104	1,582,529
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,973,144	2,005,888
Regulatory Liabilities	1,468,970	1,445,140
Other Long-Term Liabilities	268,563	239,289
Total Deferred Credits and Other Liabilities	3,710,677	3,690,317
Long-Term Debt	4,610,686	5,110,067
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
Common Shareholders' Equity:
Common Stock	60,352	60,352
Capital Surplus, Paid In	3,684,265	3,684,265
Retained Earnings	2,984,416	2,934,877
Accumulated Other Comprehensive Income (Loss)	125	132
Common Shareholders' Equity	6,729,158	6,679,626
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	17,325,825	17,178,739
The Connecticut Light and Power Company \| Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	732,472	652,150
Current Liabilities:
Accounts Payable	565,353	637,467
The Connecticut Light and Power Company \| Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	46,811	60,995
Current Liabilities:
Notes Payable to Eversource Parent	39,000
Accounts Payable	$ 152,753	$ 141,610

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Activities:
Net Income	$ 608,721	$ 552,668
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	420,481	379,579
Deferred Income Taxes	81,402	(56,524)
Uncollectible Expense	30,795	22,863
Pension, SERP and PBOP Income, Net	(28,287)	(18,811)
Regulatory Over Recoveries, Net	126,339	84,461
Amortization	402,764	455,449
Cost of Removal Expenditures	(41,385)	(67,151)
Other	28,255	15,840
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(264,738)	(288,984)
Taxes Receivable/Accrued, Net	247,015	288,790
Accounts Payable	(145,387)	(131,367)
Other Current Assets and Liabilities, Net	(141,649)	(196,218)
Net Cash Flows Provided by Operating Activities	1,324,326	1,040,595
Investing Activities:
Investments in Property, Plant and Equipment	(1,009,311)	(1,007,384)
Proceeds from Sales of Marketable Securities	40,954	64,007
Purchases of Marketable Securities	(37,075)	(61,049)
Payments for Offshore Wind Contingent Liability	(150,001)	0
Investments in Unconsolidated Affiliates	0	(504)
Other Investing Activities	5,490	5,700
Net Cash Flows Used in Investing Activities	(1,149,943)	(999,230)
Financing Activities:
Cash Dividends on Common Shares	(290,023)	(270,232)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
Decrease in Notes Payable	(992,445)	(552,694)
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Issuance of Long-Term Debt	1,502,574	1,201,407
Retirement of Long-Term Debt	(250,116)	(300,051)
Other Financing Activities	(29,342)	(23,000)
Net Cash Flows (Used In)/Provided by Financing Activities	(82,837)	31,945
Net (Decrease)/Increase in Cash and Restricted Cash	91,546	73,310
Cash and Restricted Cash - Beginning of Period	246,245	127,308
Cash and Restricted Cash - End of Period	$ 337,791	$ 200,618

COMMITMENTS AND CONTINGENCIES - Environmental Sites and Related Reserves (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) site	Dec. 31, 2025 USD ($) site
Site Contingency [Line Items]
Number of Sites \| site	67	66
Reserve \| $	$ 154.1	$ 154.3
CL&P
Site Contingency [Line Items]
Number of Sites \| site	15	15
Reserve \| $	$ 15.8	$ 14.9
NSTAR Electric
Site Contingency [Line Items]
Number of Sites \| site	15	14
Reserve \| $	$ 7.0	$ 7.0
PSNH
Site Contingency [Line Items]
Number of Sites \| site	8	8
Reserve \| $	$ 9.2	$ 9.2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-cash Investing Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 346.5	$ 427.2
CL&P
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	113.8	82.3
NSTAR Electric
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	117.1	172.8
PSNH
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 39.1	$ 58.2

DERIVATIVE INSTRUMENTS - Narrative (Details) - NSTAR Electric	1 Months Ended
	Jun. 30, 2018	Mar. 31, 2026 MWh MW	Dec. 31, 2025 MWh
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Power purchase agreement	20 years
Amount of power to be purchased under capacity-related contract (in MW) \| MW		579
Minimum \| Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Energy price		27.16	24.65
Maximum \| Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Energy price		190.27	145.33
Weighted Average \| Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Energy price		56.12	53.44

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

COMMITMENTS AND CONTINGENCIES - FERC ROE Complaints Narrative (Details) $ in Millions					3 Months Ended	15 Months Ended	30 Months Ended	36 Months Ended
	Apr. 30, 2026	Mar. 19, 2026 complaint	Oct. 16, 2018 complaint	Apr. 29, 2016 complaint	Mar. 31, 2026 USD ($)	Dec. 31, 2012	Apr. 14, 2017	Oct. 15, 2014	Dec. 31, 2025 USD ($)	Jul. 31, 2014 complaint
Loss Contingencies [Line Items]
Percentage of base ROE reasonably justified (in percent)			10.41%
Percentage of incentive cap on total ROE			13.08%
Regulatory liabilities					$ 6,063.6				$ 5,538.1
CL&P
Loss Contingencies [Line Items]
Regulatory liabilities					2,104.3				1,862.6
NSTAR Electric
Loss Contingencies [Line Items]
Regulatory liabilities					2,557.8				2,352.9
PSNH
Loss Contingencies [Line Items]
Regulatory liabilities					$ 559.2				$ 535.8
Proposed ROE \| Subsequent Event
Loss Contingencies [Line Items]
Percentage of base ROE of complaint period	11.39%
Proposed Cap \| Subsequent Event
Loss Contingencies [Line Items]
Maximum percentage cap of ROE for incentive projects	12.89%
FERC ROE Complaints
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| complaint		4	4	4
Period of complaint					15 months
Loss contingency, estimate of possible earnings impact					$ 871.0
Regulatory liabilities					60.4
FERC ROE Complaints \| CL&P
Loss Contingencies [Line Items]
Regulatory liabilities					28.7
FERC ROE Complaints \| NSTAR Electric
Loss Contingencies [Line Items]
Regulatory liabilities					24.2
FERC ROE Complaints \| PSNH
Loss Contingencies [Line Items]
Regulatory liabilities					7.5
FERC ROE Complaints \| Minimum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact					60.4
Estimated of Interest					28.8
FERC ROE Complaints \| Maximum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact					932.0
Estimated of Interest					$ 256.0
FERC ROE First, Second and Third Complaints
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| complaint										3
Base ROE percentage challenged by complainants					11.14%
FERC ROE First, Second and Third Complaints \| Minimum
Loss Contingencies [Line Items]
Maximum percentage cap of ROE for incentive projects								11.14%
FERC ROE First, Second and Third Complaints \| Maximum
Loss Contingencies [Line Items]
Maximum percentage cap of ROE for incentive projects								13.10%
FERC ROE Fourth Complaint
Loss Contingencies [Line Items]
Percentage of base ROE of complaint period				10.57%
Maximum percentage cap of ROE for incentive projects				11.74%
FERC ROE Second Complaint
Loss Contingencies [Line Items]
Percentage of base ROE							10.57%
FERC ROE First Complaint
Loss Contingencies [Line Items]
Percentage of ROE for any incentive							11.74%
Regulatory liabilities					$ 60.4
FERC ROE First Complaint \| CL&P
Loss Contingencies [Line Items]
Interest component of regulatory liability					13.7
FERC ROE First Complaint \| NSTAR Electric
Loss Contingencies [Line Items]
Interest component of regulatory liability					11.5
FERC ROE First Complaint \| PSNH
Loss Contingencies [Line Items]
Interest component of regulatory liability					$ 3.6
FERC ROE First Complaint \| Original ROE
Loss Contingencies [Line Items]
Percentage of base ROE of complaint period		11.14%				11.14%
Percentage of base ROE		11.14%						11.14%
FERC ROE First Complaint \| Revised ROE
Loss Contingencies [Line Items]
Percentage of base ROE of complaint period						9.57%
Percentage of base ROE								10.57%
FERC ROE First Complaint \| Incentive Cap
Loss Contingencies [Line Items]
Maximum percentage cap of ROE for incentive projects					12.09%	12.09%
FERC ROE First Complaint \| Previous Order ROE
Loss Contingencies [Line Items]
Percentage of base ROE of complaint period					10.57%
FERC ROE First Complaint \| Previous Incentive Cap
Loss Contingencies [Line Items]
Maximum percentage cap of ROE for incentive projects					11.74%
FERC ROE First Complaint \| Final ROE
Loss Contingencies [Line Items]
Percentage of base ROE of complaint period		9.57%			9.57%

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 03, 2026	Dec. 31, 2025
CL&P
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	$ 39,000,000		$ 0
CL&P \| Related Party
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	39,000,000.0
CL&P \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	375,000,000
Amount outstanding under line of credit	0		0
PSNH
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	79,400,000		49,300,000
PSNH \| Related Party
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	79,400,000		49,300,000
PSNH \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	250,000,000	$ 200,000,000.0
Amount outstanding under line of credit	0		0
Commercial Paper \| NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity	650,000,000
Line of Credit \| NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity	650,000,000
Eversource Parent Commercial Paper Program \| Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,000,000,000.00
Eversource Parent Commercial Paper Program \| Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000,000,000.00
Debt instrument term (in years)	5 years
Debt instrument, extension term	1 year
NSTAR Electric \| Line of Credit \| NSTAR Electric
Line of Credit Facility [Line Items]
Debt instrument term (in years)	5 years
NSTAR Electric and Eversource \| Line of Credit
Line of Credit Facility [Line Items]
Amount outstanding under line of credit	$ 0		$ 0

DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the fair values of derivative contracts, categorized by risk type, which are recorded as current or long-term derivative assets or liabilities:


NSTAR Electric (Millions of Dollars)	Fair Value Hierarchy	Commodity Supply and Price Risk Management
		As of March 31, 2026		As of December 31, 2025

Current Derivative Assets	Level 3	$	131.2		$	91.0


Long-Term Derivative Liabilities	Level 3	(636.2)			(753.1)

Schedule of Derivative Assets and Derivative Liabilities Measured at Fair Value

The following table presents changes in the Level 3 category of derivative assets and derivative liabilities measured at fair value on a recurring basis. The derivative assets and liabilities are presented on a net basis in the following table.


NSTAR Electric (Millions of Dollars)	For the Three Months Ended
	March 31, 2026
Derivatives, Net:
Fair Value as of Beginning of Year	$	(662.1)
Net Realized/Unrealized Gains Included in Regulatory Assets and Liabilities	220.5
Settlements	(63.4)
Fair Value as of End of Year	$	(505.0)

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	$ 420,481	$ 379,579
Deferred Income Taxes	81,402	(56,524)
Uncollectible Expense	30,795	22,863
Pension, SERP, and PBOP Income, Net	(28,287)	(18,811)
Regulatory Over Recoveries, Net	126,339	84,461
Cost of Removal Expenditures	(41,385)	(67,151)
Other	28,255	15,840
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(264,738)	(288,984)
Taxes Receivable/Accrued, Net	247,015	288,790
Accounts Payable	(145,387)	(131,367)
Other Current Assets and Liabilities, Net	(141,649)	(196,218)
Net Cash Flows Provided by Operating Activities	1,324,326	1,040,595
Investing Activities:
Investments in Property, Plant and Equipment	(1,009,311)	(1,007,384)
Net Cash Flows Used in Investing Activities	(1,149,943)	(999,230)
Financing Activities:
Cash Dividends on Common Stock	(290,023)	(270,232)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
Issuance of Long-Term Debt	1,502,574	1,201,407
Increase/(Decrease) in Notes Payable to Eversource Parent	(992,445)	(552,694)
Other Financing Activities	(29,342)	(23,000)
Net Cash Flows (Used In)/Provided by Financing Activities	(82,837)	31,945
Net (Decrease)/Increase in Cash and Restricted Cash	91,546	73,310
Cash and Restricted Cash - Beginning of Period	246,245	127,308
Cash and Restricted Cash - End of Period	337,791	200,618
The Connecticut Light and Power Company
Operating Activities:
Net Income	139,329	156,236
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	111,745	106,680
Deferred Income Taxes	(39,096)	(35,411)
Uncollectible Expense	5,491	4,671
Pension, SERP, and PBOP Income, Net	(4,860)	(3,614)
Regulatory Over Recoveries, Net	(19,603)	(103,101)
Amortization of Regulatory Assets, Net	280,022	343,213
Cost of Removal Expenditures	(9,053)	(16,072)
Other	25,601	826
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(91,971)	4,910
Taxes Receivable/Accrued, Net	(80,105)	57,653
Accounts Payable	(50,494)	(51,626)
Other Current Assets and Liabilities, Net	(41,910)	(41,659)
Net Cash Flows Provided by Operating Activities	225,096	422,706
Investing Activities:
Investments in Property, Plant and Equipment	(248,359)	(223,555)
Net Cash Flows Used in Investing Activities	(248,359)	(223,555)
Financing Activities:
Cash Dividends on Common Stock	(88,400)	(247,000)
Cash Dividends on Preferred Stock	(1,390)	(1,390)
Issuance of Long-Term Debt	0	400,000
Increase/(Decrease) in Notes Payable to Eversource Parent	39,000	(280,000)
Other Financing Activities	(506)	(4,153)
Net Cash Flows (Used In)/Provided by Financing Activities	(51,296)	(132,543)
Net (Decrease)/Increase in Cash and Restricted Cash	(74,559)	66,608
Cash and Restricted Cash - Beginning of Period	88,676	2,109
Cash and Restricted Cash - End of Period	$ 14,117	$ 68,717

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	PSNH	PSNH Common Stock	PSNH Capital Surplus, Paid In	PSNH Retained Earnings
Beginning balance (in shares) at Dec. 31, 2024		366,608,052				301
Beginning balance at Dec. 31, 2024	$ 15,039,387	$ 1,878,622	$ 9,428,905	$ 3,929,141	$ 2,706,802	$ 0	$ 1,898,134	$ 808,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income					66,279			66,279
Dividends on Common Stock	(276,229)			(276,229)
Capital Contributions from Eversource Parent					75,000		75,000
Ending balance (in shares) at Mar. 31, 2025		367,307,083				301
Ending balance at Mar. 31, 2025	$ 15,341,257	$ 1,878,622	9,440,596	4,203,700	2,848,081	$ 0	1,973,134	874,947
Beginning balance (in shares) at Dec. 31, 2025	375,416,880	375,416,880				301
Beginning balance at Dec. 31, 2025	$ 16,197,271	$ 1,914,273	9,937,878	4,504,983	2,876,156	$ 0	1,973,134	903,022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income					79,777			79,777
Dividends on Common Stock	$ (295,978)			(295,978)	(38,900)			(38,900)
Ending balance (in shares) at Mar. 31, 2026	375,974,644	375,974,644				301
Ending balance at Mar. 31, 2026	$ 16,530,950	$ 1,914,273	$ 9,950,113	$ 4,815,846	$ 2,917,033	$ 0	$ 1,973,134	$ 943,899

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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+ Details

DERIVATIVE INSTRUMENTS

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS

The electric and natural gas companies enter into contracts to purchase and procure energy and energy-related products for their customers, which are subject to price volatility. The costs associated with supplying energy to customers are recoverable from customers in future rates. These regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative and non-derivative contracts. Many of the derivative contracts meet the definition of, and are designated as, normal and qualify for accrual accounting under the applicable accounting guidance. The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses on the statements of income as electricity or natural gas is delivered.

Derivative contracts that are not designated as normal are recorded at fair value as derivative assets or liabilities on the balance sheets. For the electric and natural gas companies, regulatory assets or regulatory liabilities are recorded to offset the fair values of derivatives, as contract amounts are recovered from, or refunded to, customers in their respective energy supply rates. The mark to market unrealized losses or gains of these derivative contracts are deferred as regulatory assets (if the derivative is a liability) or as regulatory liabilities (if the derivative is an asset).

The following table presents the fair values of derivative contracts, categorized by risk type, which are recorded as current or long-term derivative assets or liabilities:


NSTAR Electric (Millions of Dollars)	Fair Value Hierarchy	Commodity Supply and Price Risk Management
		As of March 31, 2026		As of December 31, 2025

Current Derivative Assets	Level 3	$	131.2		$	91.0


Long-Term Derivative Liabilities	Level 3	(636.2)			(753.1)

Derivative Contracts at Fair Value with Offsetting Regulatory Amounts

Commodity Supply and Price Risk Management: In accordance with Massachusetts clean energy legislation and under the Massachusetts Clean Energy 83D procurement, in June 2018, NSTAR Electric entered into a 20-year power purchase agreement for the purchase of renewable hydroelectric energy and renewable energy attributes from Hydro-Québec. The agreement requires NSTAR Electric to purchase 579 MW of energy per hour through January 2046. Upon notice of commercial operation of the transmission line needed to deliver this energy, received on December 31, 2025, the power purchase agreement was marked to market on the balance sheet. The current and long-term portions of the contract were recorded as derivative assets and derivative liabilities, respectively, and were offset by current and long-term regulatory liabilities and regulatory assets, respectively, reflecting full recovery from or refund to NSTAR Electric’s customers.

For the three months ended March 31, 2026, gains of $220.5 million from changes in fair value associated with the NSTAR Electric derivative contract were due primarily to changes in the forward energy curve and were deferred in Current Regulatory Liabilities and Long-Term Regulatory Assets on the balance sheet.

Fair Value Measurements of Derivative Instruments

The fair value of derivative contracts utilizes both observable and unobservable inputs. The fair value is modeled using income techniques, such as discounted cash flow valuations adjusted for assumptions related to exit price. Valuations of derivative contracts using a discounted cash flow methodology include assumptions regarding future energy and energy-related prices, the timing and likelihood of scheduled payments, selection of a discount rate, and also reflect non-performance risk, including credit, using the default probability approach based on the counterparty’s credit rating for assets and the Company’s credit rating for liabilities. Valuations also give consideration to premiums or discounts that would be required by a market participant to arrive at an exit price. Future energy prices that are not quoted in an active market are based on available market data with assumptions of future market dynamics and inflation to address the full time period of the contract. Fair value measurements are prepared and reviewed by individuals with expertise in valuation techniques, pricing of energy-related products, and accounting requirements.

For NSTAR Electric’s derivative contract, unobservable inputs for future energy prices using a forward electricity bid price curve are significant to the valuation and are classified as Level 3. Level 3 unobservable inputs utilized in the valuation of NSTAR Electric’s power purchase agreement include energy prices as of March 31, 2026 ranging from $27.16 per MWh through $190.27 per MWh, or a weighted average of $56.12 per MWh, and as of December 31, 2025 ranging from $24.65 per MWh through $145.33 per MWh, or a weighted average of $53.44 per MWh, over the remaining contractual period through 2046.


NSTAR Electric (Millions of Dollars)	For the Three Months Ended
	March 31, 2026
Derivatives, Net:
Fair Value as of Beginning of Year	$	(662.1)
Net Realized/Unrealized Gains Included in Regulatory Assets and Liabilities	220.5
Settlements	(63.4)
Fair Value as of End of Year	$	(505.0)

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

A. Environmental Matters

Eversource, CL&P, NSTAR Electric and PSNH are subject to environmental laws and regulations intended to mitigate or remove the effect of past operations and improve or maintain the quality of the environment. These laws and regulations require the removal or the remedy of the effect on the environment of the disposal or release of certain specified hazardous substances at current and former operating sites. Eversource, CL&P, NSTAR Electric and PSNH have an active environmental auditing and training program and each believes it is substantially in compliance with all enacted laws and regulations.

The number of environmental sites and related reserves for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows:


	As of March 31, 2026			As of December 31, 2025
	Number of Sites	Reserve (in millions)		Number of Sites	Reserve (in millions)
Eversource	67	$	154.1	66	$	154.3
CL&P	15	15.8		15	14.9
NSTAR Electric	15	7.0		14	7.0
PSNH	8	9.2		8	9.2

Included in the number of sites and reserve amounts above are former MGP sites that were operated several decades ago and manufactured natural gas from coal and other processes, which resulted in certain by-products remaining in the environment that may pose a potential risk to human health and the environment, for which Eversource may have potential liability. Eversource’s reserve balances related to these former MGP sites were $139.9 million and $140.9 million as of March 31, 2026 and December 31, 2025, respectively, and related primarily to the natural gas business segment.

These reserve estimates are subjective in nature as they take into consideration several different remediation options at each specific site. The reliability and precision of these estimates can be affected by several factors, including new information concerning either the level of contamination at the site, the extent of Eversource's, CL&P's, NSTAR Electric's and PSNH's responsibility for remediation or the extent of remediation required, recently enacted laws and regulations or changes in cost estimates due to certain economic factors. It is possible that new information or future developments could require a reassessment of the potential exposure to required environmental remediation. As this information becomes available, management will continue to assess the potential exposure and adjust the reserves accordingly.

B. Guarantees and Indemnifications

In the normal course of business, Eversource parent provides credit assurances on behalf of its subsidiaries, including CL&P, NSTAR Electric and PSNH, in the form of guarantees. Management does not anticipate a material impact to net income or cash flows as a result of these various guarantees and indemnifications.

Guarantees issued on behalf of unconsolidated entities, including equity method ownership interests, for which Eversource parent is the guarantor, are recorded at fair value as a liability on the balance sheet at the inception of the guarantee. The fair value of guarantees issued on behalf of unconsolidated entities are recorded within Other Long-Term Liabilities on the balance sheet, and were $1.2 million and $1.3 million as of March 31, 2026 and December 31, 2025, respectively. Eversource regularly reviews performance risk under these guarantee arrangements, and believes the likelihood of payments being required under the guarantees is remote. In the event it becomes probable that Eversource parent will be required to perform under the guarantee, the amount of probable payment will be recorded.

On September 30, 2024, Eversource completed the sale of its 50 percent ownership share in the South Fork Wind and Revolution Wind projects to affiliates of Global Infrastructure Partners (GIP). Under the agreement with GIP, Eversource’s existing and certain additional credit support obligations for Revolution Wind are expected to roll off as the project completes construction. On July 9, 2024, Eversource completed the sale of its 50 percent ownership share of Sunrise Wind to Ørsted. Under the agreement with Ørsted, Eversource’s existing credit support obligations for Sunrise Wind were either terminated or indemnified by Ørsted as a result of the sale.

The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties, and primarily relates to its previously-owned offshore wind investments:

As of March 31, 2026

Company (Obligor)

Description

Maximum Exposure
(in millions)

Revolution Wind, LLC and TurbineCo, LLC

Offshore wind construction-related purchase agreements with third-party contractors (1)

122.3

Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC

Offshore wind funding and indemnification obligations (2)

143.0

Eversource Investment LLC

Revolution Wind Tax Positions (3)

300.0

Eversource TEI LLC

South Fork Wind Tax Equity (4)

50.0

South Fork Wind, LLC

Power Purchase Agreement Security (5)

7.1

Various Eversource subsidiaries

Surety bonds (6)

34.1

(1) Eversource parent issued guarantees on behalf of its previously 50 percent-owned affiliate, Revolution Wind, LLC, and on behalf of TurbineCo, LLC (successor in interest to North East Offshore, LLC (NEO)), under which Eversource parent agreed to guarantee each entity’s performance of obligations under certain construction-related purchase agreements with third-party contractors, in an aggregate amount not to exceed $682.7 million. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging between October 2027 and November 2027 and (ii) full performance of the guaranteed obligations.

(2) Eversource parent issued guarantees on behalf of its wholly-owned subsidiary Eversource Investment LLC (EI), which held Eversource's previous investments in offshore wind-related equity method investments until sale, and on behalf of its previously 50 percent-owned affiliate, South Fork Class B Member, LLC, whereby Eversource parent will guarantee each entity’s performance of certain funding obligations of the South Fork and Revolution Wind projects. Eversource parent also guaranteed certain indemnification obligations of EI associated with third-party credit support for EI’s investment in NEO. On September 30, 2024, Eversource parent issued a guaranty on behalf of its wholly-owned subsidiary, Eversource Investment Service Company LLC, whereby Eversource parent will guarantee Eversource Investment Service Company LLC’s performance of certain indemnification obligations during the onshore construction phase of the Revolution Wind project, in an amount not to exceed $100.0 million. These guarantees will not exceed $1.62 billion and expire upon the full performance of the guaranteed obligations.

(3) Eversource parent issued a guaranty on behalf of EI in an amount not to exceed $900 million, which was subsequently reduced to an amount not to exceed $300 million, to GIP in order to support certain tax positions related to Revolution Wind project through June 30, 2035.

(4) Eversource parent issued a guarantee on behalf of its wholly-owned subsidiary, Eversource TEI LLC, whereby Eversource parent will guarantee Eversource TEI LLC’s performance of certain obligations, in an amount not to exceed $50.0 million, in connection with any remaining obligations under the LLC agreement. Eversource parent’s obligations expire upon the full performance of the guaranteed obligations.

(5) Eversource parent issued a guarantee on behalf of its previously 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term, January 2044, with the option to extend to January 2049 and (ii) full performance of the guaranteed obligations.

(6) Surety bonds expire in 2026 and 2027. Expiration dates reflect termination dates, the majority of which will be renewed or extended. Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded.

Eversource parent entered into a guarantee on behalf of EI, under which Eversource parent would guarantee EI’s obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. As of March 31, 2026, there are no letters of credit issued under this guarantee. The guarantee will remain in effect until full performance of the guaranteed obligations.

On September 30, 2024, Eversource entered into an agreement with GIP and Ørsted to contingently provide future credit support up to a maximum of $850 million in guarantees, if required, to support third-party tax equity financing for Revolution Wind.

C. FERC ROE Complaints

Four separate complaints were filed at the FERC by combinations of New England state attorneys general, state regulatory commissions, consumer advocates, consumer groups, municipal parties and other parties (collectively, the Complainants). In each of the first three complaints, filed on October 1, 2011, December 27, 2012, and July 31, 2014, respectively, the Complainants challenged the New England Transmission Owners’ (NETOs’) base return on equity (ROE) of 11.14 percent that had been utilized since 2006 and sought an order to reduce it prospectively from the date of the final FERC order and for the separate 15-month complaint periods. In the fourth complaint, filed April 29, 2016, the Complainants challenged the NETOs' base ROE billed of 10.57 percent and the maximum ROE including transmission incentives (incentive cap) of 11.74 percent, asserting that these ROEs were unjust and unreasonable.

The ROE originally billed during the period October 1, 2011 (beginning of the first complaint period) through October 15, 2014 consisted of a base ROE of 11.14 percent and incentives up to 13.1 percent. On October 16, 2014, FERC issued Opinion No. 531-A and set the base ROE at 10.57 percent and the incentive cap at 11.74 percent for the first complaint period. This was also effective for all prospective billings to customers beginning October 16, 2014. The NETOs filed an appeal of this decision, which was vacated on April 14, 2017 by the U.S. Court of Appeals for the D.C. Circuit (the D.C. Circuit Court). All amounts associated with Opinion No. 531-A on the first complaint period lowering the base ROE of 11.14 percent to 10.57 percent were refunded by 2015.

On October 16, 2018, FERC issued an order on all four complaints describing how it intended to address the issues that were remanded by the D.C. Circuit Court. FERC proposed a new framework to determine (1) whether an existing ROE is unjust and unreasonable and, if so, (2) how to calculate a replacement ROE. The FERC order included illustrative calculations for the first complaint using FERC's proposed frameworks with financial data from that complaint. Those illustrative calculations indicated that for the first complaint period, the preliminary just and reasonable base ROE for the NETOs, which FERC concludes are of average financial risk, is 10.41 percent and the preliminary incentive cap on total ROE is 13.08 percent.

On March 19, 2026, FERC issued Opinion No. 594 in the NETO ROE proceedings, attempting to resolve all four pending complaints dating back to 2011 and respond to the D.C. Circuit Court’s April 14, 2017 decision vacating FERC’s prior decision in the first complaint, which found that the FERC had failed to (1) make an explicit, reasoned finding that the then-existing 11.14 percent base ROE was unjust and unreasonable before imposing a replacement ROE, and (2) adequately justify placing the ROE at the midpoint of the upper half of the zone of reasonableness. In Opinion No. 594, FERC applied a revised ROE methodology that it believes is consistent with its 2024 ROE Order on remand to the Midcontinent ISO (MISO) transmission owners, to satisfy the first step in the FERC process to revise the ROE in a Section 206 proceeding by finding the NETOs’ base ROE of 11.14 percent is unjust and unreasonable. FERC then found the just and reasonable replacement base ROE to be 9.57 percent with an incentive cap of 12.09 percent for the first complaint period (October 1, 2011 – December 31, 2012) and applied this same ROE prospectively, effective October 16, 2014, the date of the first complaint order vacated by the D.C. Circuit Court. FERC directed the NETOs to issue refunds with interest for the applicable refund periods. This decision decreases the allowed base ROE of 10.57 percent with an incentive cap of 11.74 percent to a base ROE of 9.57 percent with an incentive cap of 12.09 percent. The second, third and fourth NETO ROE complaints were dismissed as part of the decision and FERC did not direct any refunds for the periods associated with those proceedings.

On April 14, 2026, FERC granted an extension of the refund deadline to May 20, 2027. On April 14, 2026, Eversource and Avangrid filed a joint motion requesting a stay of the retroactive refund obligation applicable to the period October 16, 2014 through March 19, 2026 (retroactive refund period) with the D.C. Circuit Court.

On April 20, 2026, the NETOs submitted to FERC a request for rehearing of Opinion No. 594 to reconsider its decision by highlighting several deficiencies including but not limited to the unlawful retroactive refund period with interest extended beyond the 15-month statutory relief authority granted in Section 206(b) of the Federal Power Act, the FERC not proving that the previously approved 11.14 percent base ROE was unjust and unreasonable as remanded by the D.C. Circuit Court, the flawed methodologies applied in setting the replacement 9.57 percent base ROE, failing to comply with the requirement for FERC to use data that is relevant to the current period at the time of the decision for the NETOs’ going forward ROE, and procedural issues related to overlapping complaints.

On April 30, 2026, the NETOs submitted a Federal Power Act Section 205 filing to FERC, which is a formal request by a public utility to change the ROE rate prospectively and requires the utility to prove the proposed change is just and reasonable. The NETOs proposed a replacement ROE of 11.39 percent, resulting in a cap of 12.89 percent including incentives, which is based on current market data utilizing FERC’s ROE methodology from Opinion No. 594. The NETOs requested an effective date of June 30, 2026. FERC has 60 days to act on the rate proposal and can suspend the proposed rate change for up to five months after the initial 60-day notice. If a settlement is not reached among the parties to the FERC proceeding, Eversource would begin billing the proposed ROE by December 2026 on a subject-to-refund basis after the completion of a hearing on the matter.

As a result of the March 19, 2026 FERC decision, Eversource has determined that a loss is probable and that a range of loss is reasonably estimable. Based on Eversource’s current evaluation of the relevant facts and circumstances, the Company has estimated a range of reasonably possible pre-tax losses of $60.4 million to $932 million, which includes a range of interest of $28.8 million to $256 million, as of March 31, 2026. The low end of the estimated range of loss reflects estimated refunds associated with the fifteen-month first complaint period, including interest. The high end of the estimated range of loss includes the refunds associated with the first complaint period, as well as estimated refunds for the retroactive refund period from October 16, 2014 through March 19, 2026, including interest, in the pre-tax amount of approximately $871 million. The range of loss estimates use the 9.57 percent replacement ROE and incentive cap of 12.09 percent prescribed in the March 19, 2026 FERC decision. Based on Eversource’s legal assessment of the Federal Power Act and the legal and regulatory deficiencies underlying this decision as identified in the rehearing request, including that the retroactive application is inconsistent with the statutory limitations under the Federal Power Act, Eversource does not believe that refunds at the high end of the range for the retroactive period are probable. Eversource continues to challenge the March 19, 2026 FERC decision, but cannot predict the ultimate outcome of these proceedings.

The Company has recorded a current regulatory liability for revenues subject to refund of $60.4 million (pre-tax) as of March 31, 2026, which represents the low end of the range, as no amount within this range is considered a better estimate. The liability recorded reflects the difference between the billed 10.57 percent base ROE and the new 9.57 percent base ROE for the first complaint period, including interest. The liability consists of $28.7 million, $24.2 million and $7.5 million for CL&P, NSTAR Electric and PSNH, respectively, of which $13.7 million, $11.5 million and $3.6 million is accrued interest, respectively, as of March 31, 2026. The revenues subject to refund were recorded as a reduction to Operating Revenues and the accrued interest was recorded as an increase to Interest Expense in the statements of income. Eversource does not have any other reserves recorded for the other complaint periods, as these remaining complaints were dismissed.

The Company’s estimates are based on currently available information; however, it is reasonably possible that the ultimate resolution of this matter may result in a loss in excess of the amount accrued, and such additional losses could have a material impact on the financial condition, results of operations, and cash flows in a future period.

D. Spent Nuclear Fuel Obligations - Yankee Companies

CL&P, NSTAR Electric and PSNH have plant closure and fuel storage cost obligations to the Yankee Companies, which have each completed the physical decommissioning of their respective nuclear power facilities and are now engaged in the long-term storage of their spent fuel. The Yankee Companies fund these costs through litigation proceeds received from the DOE and, to the extent necessary, through wholesale, FERC-approved rates charged under power purchase agreements with several New England utilities, including CL&P, NSTAR Electric and PSNH. CL&P, NSTAR Electric and PSNH, in turn recover these costs from their customers through state regulatory commission-approved retail rates. The Yankee Companies collect amounts that management believes are adequate to recover the remaining plant closure and fuel storage cost estimates for the respective plants. Management believes CL&P and NSTAR Electric will recover their shares of these obligations from their customers. PSNH has recovered its total share of these costs from its customers.

Spent Nuclear Fuel Litigation:

The Yankee Companies have filed complaints against the DOE in the Court of Federal Claims seeking monetary damages resulting from the DOE's failure to accept delivery of, and provide for a permanent facility to store, spent nuclear fuel pursuant to the terms of the 1983 spent fuel and high-level waste disposal contracts between the Yankee Companies and the DOE. The court previously awarded the Yankee Companies damages for Phases I, II, III, and IV of litigation resulting from the DOE's failure to meet its contractual obligations. These Phases covered damages incurred in the years 1998 through 2016, and the awarded damages have been received by the Yankee Companies with certain amounts of the damages refunded to their customers.

DOE Phase V Damages - In March 2021, the Yankee Companies filed Phase V lawsuits against the DOE seeking damages for its continued failure to accept spent nuclear fuel, later expanding the claims to include 2021 costs, bringing total claimed damages to $153.5 million. The parties reached a $145 million agreement in principle to settle the Phase V complaint, approved in November 2024. The Department of Justice filed a notice of appeal in January 2025 on an issue outside the scope of the settlement, with oral arguments expected in 2026.

DOE Phase VI Damages – On March 31, 2026, each of the Yankee Companies filed a sixth set of lawsuits against the DOE in the Court of Federal Claims. The Yankee Companies are seeking monetary damages for CYAPC, YAEC and MYAPC, resulting from the DOE’s failure to begin accepting spent nuclear fuel for disposal covering the years from 2022 to 2025 (DOE Phase VI).

E. Offshore Wind Sale and Contingent Liability

On July 9, 2024, Eversource completed the sale of its 50 percent ownership share of Sunrise Wind to Ørsted for adjusted proceeds of $152 million. Ørsted paid Eversource $118 million at the closing of the sale transaction and remaining proceeds of $34 million will be paid after onshore construction is completed and certain other construction milestones are achieved. With completion of the sale, Eversource does not have any ongoing financial obligations associated with Sunrise Wind.

On September 30, 2024, Eversource completed the sale of its 50 percent ownership share in the South Fork Wind and Revolution Wind projects to GIP for adjusted gross proceeds of $745 million, which were received at closing. As part of the sale, Eversource and GIP agreed to make certain post-closing purchase price adjustment payments that will impact the final purchase price. The post-closing purchase price adjustment payments include cost sharing obligations that require Eversource to share equally in GIP’s funding obligations up to an effective cap of approximately $240 million of incremental capital expenditure overruns incurred during the construction phase for Revolution Wind, after which Eversource will have responsibility for GIP’s obligations for any additional capital expenditure overruns in excess of this amount. The purchase price is also subject to post-closing adjustments as a result of final project economics, which includes Eversource’s obligation to maintain GIP’s internal rate of return through the construction period for each project as specified in the agreement. For Revolution Wind, purchase price adjustment payments are expected to be completed in late 2026. South Fork Wind has achieved commercial operation, and Eversource made a purchase price adjustment payment related to this project in June 2025. All matters relating to South Fork Wind have been resolved with no material impacts.

Upon the completion of the sales in 2024, Eversource recorded a contingent liability of $365 million, reflecting its estimate of the future obligations under the terms of the sale to GIP. The total sales proceeds were compared to the carrying value of the investments, including the estimate of liability for-post-closing adjustment payments to GIP, and Eversource recognized an aggregate after-tax loss on the sales of its offshore wind investments of $524 million, which included a net $60 million increase in income tax expense including an increase in the valuation allowance for unused capital losses in 2024.

In the third quarter of 2025, Eversource received an updated report from GIP on the construction status of Revolution Wind, which included revised projections of total construction costs. The revised cost projections reflected known and quantifiable cost increases, including those associated with the impacts of damage to the wind turbine installation vessel, insurance costs, tariff impacts, and costs incurred as a result of the stop-work order for Revolution Wind received on August 22, 2025 from the Bureau of Ocean Energy Management that halted all offshore wind construction activities through September 22, 2025. Based on those developments, Eversource recognized a pre-tax charge of $284 million in the third quarter of 2025 as a result of the aggregate impact of these items to increase the liability for purchase price adjustments associated with the offshore wind projects.

Payments made in the first quarter of 2026 reduced the contingent liability and were reflected within investing activities on the statement of cash flows. Payments related to cost overruns for the Revolution Wind project paid to GIP.

Eversource continually evaluates the contingent liability and will reassess the balance as new information becomes available. Based on most recent updates from GIP on the construction status of Revolution Wind, factoring in estimated costs incurred as a result of a second stop-work order for Revolution Wind received on December 22, 2025 and removed on January 12, 2026, revised insurance estimates, and other information currently available, Eversource believes that the contingent liability balance as of March 31, 2026 is an adequate estimate to cover this contingent liability for purchase price adjustments. As of March 31, 2026 and December 31, 2025, the contingent liability totaled $298.2 million and $448.2 million, respectively, and is recorded as a current liability on Eversource’s balance sheets, based upon the timing of expected payments to GIP.

Eversource relies on information that it receives from the project owners for the construction-related, delay-related, and insurance-related costs of Revolution Wind. Eversource uses its judgment to adjust, as needed, its expected obligations to GIP while construction of Revolution Wind is completed.

New information or future developments that arise as the construction of Revolution Wind progresses will necessitate a reassessment of the estimated liability to GIP. The Company reviews available projections of total construction costs, including the latest cost estimates and project timeline, to determine if any changes to this liability are warranted.

It is reasonably possible that as additional updated cost estimates become available, and if additional cost overruns materialize or other adverse changes in facts, regulations and circumstances occur, there could be additional losses and increases to the offshore wind contingent liability, which could be material. The Company will continue to monitor developments and evaluate potential exposures related to this contingency and will revise its estimated liability as additional information becomes available.

Contingencies are evaluated using the best information available at the time the financial statements are published, and this assessment involves judgments and assumptions about future events. Factors that could increase the obligation to GIP include construction cost overruns for Revolution Wind as well as the timing and extent of construction delays, which would impact the economics associated with the purchase price adjustment, and the eligibility for federal investment tax credits for Revolution Wind at a value lower than assumed and included in the purchase price. The purchase price of Revolution Wind included the sales value related to a 40 percent level of federal investment tax credits. A change in the expected value or qualification of investment tax credit adders could result in a significant loss in a future period.

Total net proceeds could also be adjusted for a benefit due to Eversource if there are lower operation costs or higher availability of the projects through the period that is four years following the commercial operation of Revolution Wind.

EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Basic earnings per share is computed based upon the weighted average number of common shares outstanding during each period. Diluted earnings per share is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect of certain share-based compensation awards as if they were converted into outstanding common shares. The dilutive effect of unvested RSU and performance share awards is calculated using the treasury stock method. RSU and performance share awards are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. For the three months ended March 31, 2026 and 2025, there were no antidilutive share awards excluded from the computation of diluted EPS.

The following table sets forth the components of basic and diluted earnings per share:


Eversource (Millions of Dollars, except share information)	For the Three Months Ended
		March 31, 2026		March 31, 2025
Net Income Attributable to Common Shareholders		$	606.8	$	550.8
Weighted Average Common Shares Outstanding:
Basic		376,026,090		367,320,246
Dilutive Effect		557,524		357,372
Diluted		376,583,614		367,677,618
Basic and Diluted Earnings Per Common Share		$	1.61	$	1.50

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:


	For the Three Months Ended March 31, 2026						For the Three Months Ended March 31, 2025
Eversource (Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Defined Benefit Plans		Total		Qualified Cash Flow Hedging Instruments		Defined Benefit Plans		Total
Balance as of Beginning of Period	$	(0.4)	$	(20.1)	$	(20.5)	$	(0.4)	$	(26.1)	$	(26.5)


Amounts Reclassified from AOCI	—		0.1		0.1		—		2.5		2.5
Net OCI	—		0.1		0.1		—		2.5		2.5
Balance as of End of Period	$	(0.4)	$	(20.0)	$	(20.4)	$	(0.4)	$	(23.6)	$	(24.0)

Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses that arose during the year and were recognized in AOCI. The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Other Income, Net over the average future employee service period, and are reflected in amounts reclassified from AOCI. Defined benefit plan amounts reclassified from AOCI also include a settlement loss amortized into net periodic benefit plan expense/(income) for the three months ended March 31, 2025. See Note 8, “Pension Benefits and Postretirement Benefits Other Than Pension,” for further information.

FAIR VALUE OF FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

The following methods and assumptions were used to estimate the fair value of each of the following financial instruments:

Preferred Stock, Long-Term Debt and Rate Reduction Bonds: The fair value of CL&P's and NSTAR Electric's preferred stock is based upon pricing models that incorporate interest rates and other market factors, valuations or trades of similar securities and cash flow projections. The fair value of long-term debt and RRB debt securities is based upon pricing models that incorporate quoted market prices for those issues or similar issues adjusted for market conditions, credit ratings of the respective companies and treasury benchmark yields. The fair values provided in the table below are classified as Level 2 within the fair value hierarchy. Carrying amounts and estimated fair values are as follows:


	Eversource				CL&P				NSTAR Electric				PSNH
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
As of March 31, 2026:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	128.2	$	116.2	$	94.6	$	43.0	$	33.6	$	—	$	—
Long-Term Debt	29,504.2		28,026.9		5,110.7		4,767.4		5,946.7		5,683.4		2,031.9		1,851.6
Rate Reduction Bonds	302.5		294.3		—		—		—		—		302.5		294.3

As of December 31, 2025:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	126.1	$	116.2	$	92.9	$	43.0	$	33.2	$	—	$	—
Long-Term Debt	28,265.4		27,055.5		5,110.1		4,844.7		5,945.6		5,752.6		2,031.3		1,874.8
Rate Reduction Bonds	324.1		320.2		—		—		—		—		324.1		320.2

Derivative Instruments and Marketable Securities: Derivative instruments and investments in marketable securities are carried at fair value. For further information, see Note 4, "Derivative Instruments," and Note 5, "Marketable Securities," to the financial statements.

See Note 1D, "Summary of Significant Accounting Policies – Fair Value Measurements," for the fair value measurement policy and the fair value hierarchy.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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+ Details

SHORT-TERM AND LONG-TERM DEBT - Summary of Long-Term Debt Issuance and Repayments (Details) - USD ($) $ in Millions		1 Months Ended
	Feb. 28, 2026	Mar. 31, 2026	Feb. 28, 2026
Eversource Parent Series A Junior Notes
Debt Instrument [Line Items]
Interest Rate (in percent)	6.10%		6.10%
Issuance			$ 750.0
Debt instrument term (in years)	5 years
Spread rate (in percent)	2.521%
Eversource Parent Series B Junior Notes
Debt Instrument [Line Items]
Interest Rate (in percent)	6.35%		6.35%
Issuance			$ 750.0
Debt instrument term (in years)	5 years
Spread rate (in percent)	2.325%
Eversource Parent Series J Senior Notes
Debt Instrument [Line Items]
Interest Rate (in percent)		3.35%
Repayments		$ (250.0)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Allowance for uncollectible accounts	$ 611,700	$ 580,539
The Connecticut Light and Power Company
Allowance for uncollectible accounts	$ 274,007	$ 258,514

SHORT-TERM AND LONG-TERM DEBT

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

SHORT-TERM AND LONG-TERM DEBT

Short-Term Debt - Commercial Paper Programs and Credit Agreements: Eversource parent has a $2.00 billion commercial paper program allowing Eversource parent to issue commercial paper as a form of short-term debt. Eversource parent, CL&P, PSNH, NSTAR Gas, Yankee Gas, EGMA and Aquarion Water Company of Connecticut are parties to a five-year $2.00 billion revolving credit facility. Effective October 11, 2025, the revolving credit facility’s termination date was extended for one additional year to October 11, 2030, pursuant to the extension provisions contained in the existing credit agreement. This revolving credit facility serves to backstop Eversource parent's $2.00 billion commercial paper program.

NSTAR Electric has a $650 million commercial paper program allowing NSTAR Electric to issue commercial paper as a form of short-term debt. NSTAR Electric is also a party to a five-year $650 million revolving credit facility. Effective October 11, 2025, the revolving credit facility’s termination date was extended for one additional year to October 11, 2030, pursuant to the extension provisions contained in the existing credit agreement. This revolving credit facility serves to backstop NSTAR Electric's $650 million commercial paper program.

The amount of borrowings outstanding and available under the commercial paper programs were as follows:


	Borrowings Outstanding as of				Available Borrowing Capacity as of				Weighted-Average Interest Rate as of
	March 31, 2026		December 31, 2025		March 31, 2026		December 31, 2025		March 31, 2026		December 31, 2025
(Millions of Dollars)
Eversource Parent Commercial Paper Program	$	533.0	$	1,280.0	$	1,467.0	$	720.0	4.08	%	3.98	%
NSTAR Electric Commercial Paper Program	—		245.4		650.0		404.6		—	%	3.87	%

There were no borrowings outstanding on the revolving credit facilities as of March 31, 2026 and December 31, 2025.

CL&P and PSNH have uncommitted line of credit agreements totaling $375 million and $250 million, respectively, all of which will expire in either May 2026, September 2026, October 2026 or May 2027. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of March 31, 2026 and December 31, 2025.

Amounts outstanding under the commercial paper programs are included in Notes Payable and classified in current liabilities on the Eversource and NSTAR Electric balance sheets, as all borrowings are outstanding for no more than 364 days at one time.

Intercompany Borrowings: Eversource parent uses its available capital resources to provide loans to its subsidiaries to assist in meeting their short-term borrowing needs. Eversource parent records intercompany interest income from its loans to subsidiaries, which is eliminated in consolidation. Intercompany loans from Eversource parent to its subsidiaries are eliminated in consolidation on Eversource's balance sheets. As of March 31, 2026 and December 31, 2025, there were intercompany loans from Eversource parent to PSNH of $79.4 million and $49.3 million, respectively. As of March 31, 2026, there were intercompany loans from Eversource parent to CL&P of $39.0 million. Eversource parent charges interest on these intercompany loans at the same weighted-average interest rate as its commercial paper program. Intercompany loans from Eversource parent are included in Notes Payable to Eversource Parent and classified in current liabilities on the respective subsidiary's balance sheets, as these intercompany borrowings are outstanding for no more than 364 days at one time.

Sources and Uses of Cash: The Company expects the future operating cash flows of Eversource, CL&P, NSTAR Electric and PSNH, along with existing borrowing availability and access to both debt and equity markets, will be sufficient to meet any working capital and future operating requirements, and capital investment forecasted opportunities.

Long-Term Debt Issuance Authorizations: On March 3, 2026, PSNH filed a petition with the NHPUC requesting authorization to issue up to $200.0 million in long-term debt through December 31, 2026.

Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments:


(Millions of Dollars)	Interest Rate		Issuance/(Repayment)		Issue Date or Repayment Date	Maturity Date	Use of Proceeds for Issuance/ Repayment Information
Eversource Parent Series A Junior Notes (1)	6.10	%	$	750.0	February 2026	August 2056	Repay Series AA Senior Notes at maturity, repay Series U Senior Notes at maturity, repaid short-term debt, and for general corporate purposes
Eversource Parent Series B Junior Notes (2)	6.35	%	$	750.0	February 2026	August 2056	Repay Series AA Senior Notes at maturity, repay Series U Senior Notes at maturity, repaid short-term debt, and for general corporate purposes
Eversource Parent Series J Senior Notes	3.35	%	$	(250.0)	March 2026	March 2026	Paid at maturity

(1) The Eversource Parent Series A Junior Subordinated Notes bear interest at a fixed rate of 6.10 percent per year from August 15, 2026 to August 14, 2031. Thereafter, the interest rate resets every five years, commencing on August 15, 2031, at a rate per year equal to the five-year U.S. Treasury Rate plus a spread of 2.521 percent.

(2) The Eversource Parent Series B Junior Subordinated Notes bear interest at a fixed rate of 6.35 percent per year from August 15, 2026 to August 14, 2036. Thereafter, the interest rate resets every five years, commencing on August 15, 2036, at a rate per year equal to the five-year U.S. Treasury Rate plus a spread of 2.325 percent.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 470
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+ Details

REVENUES

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

REVENUES

The following tables present operating revenues disaggregated by revenue source:



















	For the Three Months Ended March 31, 2026
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,467.8	$	844.7	$	—	$	32.7	$	—	$	—	$	2,345.2
Commercial	833.1		390.4		—		16.2		—		(3.5)		1,236.2
Industrial	97.7		83.6		—		1.1		—		(6.5)		175.9
Total Retail Tariff Sales Revenues	2,398.6		1,318.7		—		50.0		—		(10.0)		3,757.3
Wholesale Transmission Revenues	—		—		632.3		—		—		(466.3)		166.0
Wholesale Market Sales Revenues	521.2		59.4		—		1.1		—		—		581.7
Other Revenues from Contracts with Customers	20.5		1.6		11.1		0.7		484.4		(485.3)		33.0

Total Revenues from Contracts with Customers	2,940.3		1,379.7		643.4		51.8		484.4		(961.6)		4,538.0
Alternative Revenue Programs	(5.5)		(7.6)		(58.9)		1.6		—		29.7		(40.7)
Other Revenues	5.7		1.1		0.1		0.2		—		—		7.1
Total Operating Revenues	$	2,940.5	$	1,373.2	$	584.6	$	53.6	$	484.4	$	(931.9)	$	4,504.4



















	For the Three Months Ended March 31, 2025
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,489.3	$	696.5	$	—	$	31.4	$	—	$	—	$	2,217.2
Commercial	807.6		305.9		—		15.3		—		(2.0)		1,126.8
Industrial	104.1		67.8		—		1.0		—		(5.9)		167.0
Total Retail Tariff Sales Revenues	2,401.0		1,070.2		—		47.7		—		(7.9)		3,511.0
Wholesale Transmission Revenues	—		—		594.0		—		—		(439.3)		154.7
Wholesale Market Sales Revenues	347.8		62.3		—		1.1		—		—		411.2
Other Revenues from Contracts with Customers	20.8		1.4		3.6		0.6		439.0		(435.8)		29.6

Total Revenues from Contracts with Customers	2,769.6		1,133.9		597.6		49.4		439.0		(883.0)		4,106.5
Alternative Revenue Programs	2.2		6.4		(49.9)		0.6		—		45.2		4.5
Other Revenues	5.9		1.1		0.1		0.3		—		—		7.4
Total Operating Revenues	$	2,777.7	$	1,141.4	$	547.8	$	50.3	$	439.0	$	(837.8)	$	4,118.4




















	For the Three Months Ended March 31, 2026						For the Three Months Ended March 31, 2025
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	787.7	$	471.2	$	208.9	$	801.2	$	506.2	$	181.9
Commercial	304.4		434.5		94.7		344.1		375.7		88.3
Industrial	39.0		34.7		24.0		48.4		30.8		24.9
Total Retail Tariff Sales Revenues	1,131.1		940.4		327.6		1,193.7		912.7		295.1
Wholesale Transmission Revenues	269.2		236.4		126.7		251.1		218.7		124.2
Wholesale Market Sales Revenues	368.7		143.3		9.2		280.0		57.3		10.5
Other Revenues from Contracts with Customers	15.0		13.4		3.7		8.7		11.9		4.3

Total Revenues from Contracts with Customers	1,784.0		1,333.5		467.2		1,733.5		1,200.6		434.1
Alternative Revenue Programs	(32.5)		(16.3)		(15.6)		(18.9)		(9.1)		(19.7)
Other Revenues	2.2		2.4		1.2		2.7		2.4		0.9
Eliminations	(185.6)		(188.5)		(69.3)		(176.1)		(179.7)		(67.3)
Total Operating Revenues	$	1,568.1	$	1,131.1	$	383.5	$	1,541.2	$	1,014.2	$	348.0

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
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-Paragraph 9
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

REGULATORY ACCOUNTING (Tables)

3 Months Ended

Mar. 31, 2026

Regulated Operations [Abstract]

Schedule of Components of Regulatory Assets

The components of regulatory assets were as follows:


	As of March 31, 2026								As of December 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Storm Costs, Net	$	2,100.4	$	1,028.9	$	602.7	$	468.8	$	1,959.3	$	991.3	$	499.6	$	468.4
Regulatory Tracking Mechanisms	1,540.3		172.7		749.7		115.9		1,573.8		206.5		705.6		93.2
Income Taxes, Net	1,051.0		547.0		165.9		22.4		1,044.5		546.1		161.5		23.3
Benefit Costs	984.9		172.5		297.1		61.3		992.8		173.7		300.0		61.7
Derivative Contracts	636.2		—		636.2		—		753.2		0.1		753.1		—
Securitized Stranded Costs	295.3		—		—		295.3		306.1		—		—		306.1
Cost of Removal	267.5		—		8.1		—		262.5		—		8.1		—
Goodwill-related	226.2		—		194.2		—		230.4		—		197.8		—
Asset Retirement Obligations	166.0		44.9		86.1		5.5		162.8		44.2		84.6		5.4
Environmental Remediation Costs	134.2		—		—		—		136.1		—		—		—
EGMA Acquisition and Integration Costs	82.3		—		—		—		82.3		—		—		—
Other Regulatory Assets	181.1		19.4		84.5		2.7		189.9		19.5		92.0		3.0
Total Regulatory Assets	7,665.4		1,985.4		2,824.5		971.9		7,693.7		1,981.4		2,802.3		961.1
Less: Current Portion	1,897.2		235.0		1,018.9		101.4		1,975.1		265.2		978.8		119.9
Total Long-Term Regulatory Assets	$	5,768.2	$	1,750.4	$	1,805.6	$	870.5	$	5,718.6	$	1,716.2	$	1,823.5	$	841.2

Schedule of Components of Regulatory Liabilities

The components of regulatory liabilities were as follows:


	As of March 31, 2026								As of December 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017	$	2,407.8	$	928.6	$	841.2	$	317.3	$	2,423.4	$	933.3	$	847.9	$	319.8
Regulatory Tracking Mechanisms	1,578.2		661.8		648.2		125.5		1,186.6		457.3		535.2		111.2
Cost of Removal	917.7		297.5		498.0		54.6		867.1		275.1		479.4		45.5
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP	534.5		76.2		264.7		50.9		509.4		72.8		252.5		48.5
AFUDC - Transmission	187.3		74.7		112.6		—		179.4		72.0		107.4		—
Derivative Contract	131.2		—		131.2		—		91.0		—		91.0		—
Benefit Costs	74.9		9.1		20.2		6.9		80.4		8.8		24.5		6.8
Other Regulatory Liabilities	232.0		56.4		41.7		4.0		200.8		43.3		15.0		4.0
Total Regulatory Liabilities	6,063.6		2,104.3		2,557.8		559.2		5,538.1		1,862.6		2,352.9		535.8
Less: Current Portion	1,740.0		635.3		835.4		134.1		1,264.6		417.5		650.8		118.4
Total Long-Term Regulatory Liabilities	$	4,323.6	$	1,469.0	$	1,722.4	$	425.1	$	4,273.5	$	1,445.1	$	1,702.1	$	417.4

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

The following tables summarize property, plant and equipment by asset category:


Eversource	As of March 31, 2026		As of December 31, 2025
(Millions of Dollars)
Distribution - Electric	$	23,108.6	$	22,695.3
Distribution - Natural Gas	9,899.0		9,888.0
Transmission - Electric	17,181.8		17,082.4
Distribution - Water	2,608.3		2,577.3
Solar	206.8		206.8
Utility	53,004.5		52,449.8
Other (1)	2,532.6		2,476.3
Property, Plant and Equipment, Gross	55,537.1		54,926.1
Less: Accumulated Depreciation
Utility	(11,114.0)		(10,911.7)
Other	(1,303.9)		(1,246.1)
Total Accumulated Depreciation	(12,417.9)		(12,157.8)
Property, Plant and Equipment, Net	43,119.2		42,768.3
Construction Work in Progress	3,351.0		3,162.7
Total Property, Plant and Equipment, Net	$	46,470.2	$	45,931.0

(1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.


	As of March 31, 2026						As of December 31, 2025
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	9,038.7	$	10,870.2	$	3,239.9	$	8,906.0	$	10,635.7	$	3,193.8
Transmission - Electric	7,263.7		6,749.2		3,170.6		7,222.5		6,722.9		3,138.7
Solar	—		206.8		—		—		206.8		—
Property, Plant and Equipment, Gross	16,302.4		17,826.2		6,410.5		16,128.5		17,565.4		6,332.5
Less: Accumulated Depreciation	(3,140.8)		(4,088.0)		(1,105.2)		(3,081.3)		(4,014.2)		(1,085.4)
Property, Plant and Equipment, Net	13,161.6		13,738.2		5,305.3		13,047.2		13,551.2		5,247.1
Construction Work in Progress	606.4		1,831.2		264.4		576.1		1,757.7		260.6
Total Property, Plant and Equipment, Net	$	13,768.0	$	15,569.4	$	5,569.7	$	13,623.3	$	15,308.9	$	5,507.7

COMMITMENTS AND CONTINGENCIES - Spent Nuclear Fuel Obligations Narrative (Details) - Yankee Companies - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2024	Mar. 31, 2021
Loss Contingencies [Line Items]
Damages sought		$ 153.5
Litigation settlement, amount	$ 145.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 450
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-Topic 460
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 68.1	$ 63.7
CL&P
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 52.9	$ 52.9

REGULATORY ACCOUNTING - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	$ 247.4	$ 244.2
Regulatory costs	123.7	123.2
Regulatory liabilities	6,063.6	5,538.1
FERC ROE Complaints
Regulatory Assets [Line Items]
Regulatory liabilities	60.4
CL&P
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	130.3	127.1
Regulatory costs	60.9	57.0
Regulatory liabilities	2,104.3	1,862.6
CL&P \| FERC ROE Complaints
Regulatory Assets [Line Items]
Regulatory liabilities	28.7
NSTAR Electric
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	47.4	51.0
Regulatory costs	30.7	34.0
Regulatory liabilities	2,557.8	2,352.9
NSTAR Electric \| FERC ROE Complaints
Regulatory Assets [Line Items]
Regulatory liabilities	24.2
PSNH
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	5.1	5.4
Regulatory liabilities	559.2	$ 535.8
PSNH \| FERC ROE Complaints
Regulatory Assets [Line Items]
Regulatory liabilities	$ 7.5

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Other Comprehensive Loss, Net of Tax:
Comprehensive Income Attributable to Common Shareholders	$ 606,971	$ 553,311
PSNH
Net Income	$ 79,777	$ 66,279

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
Class of Stock [Line Items]
Par value (in dollars per share)	$ 5	$ 5
Authorized (in shares)	410,000,000	410,000,000
Issued as of (in shares)	382,854,501	382,854,501
CL&P
Class of Stock [Line Items]
Par value (in dollars per share)	$ 10	$ 10
Authorized (in shares)	24,500,000	24,500,000
Issued as of (in shares)	6,035,205	6,035,205
NSTAR Electric
Class of Stock [Line Items]
Par value (in dollars per share)	$ 1	$ 1
Authorized (in shares)	100,000,000	100,000,000
Issued as of (in shares)	200	200
PSNH
Class of Stock [Line Items]
Par value (in dollars per share)	$ 1	$ 1
Authorized (in shares)	100,000,000	100,000,000
Issued as of (in shares)	301	301

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

COMMON SHARES

The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values:


	Shares
			Authorized as of March 31, 2026 and December 31, 2025	Issued as of
	Par Value			March 31, 2026	December 31, 2025
Eversource	$	5	410,000,000	382,854,501	382,854,501
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

Common Share Issuances: On May 30, 2025, Eversource entered into an equity distribution agreement pursuant to which it may offer and sell up to $1.2 billion of its common shares from time to time through an “at-the-market” (ATM) equity offering program. Eversource may issue and sell its common shares through its sales agents during the term of this agreement. Shares were offered in transactions on the New York Stock Exchange, in the over-the-counter market, through negotiated transactions or otherwise. Sales may be made at either market prices prevailing at the time of sale, at prices related to such prevailing market prices or at negotiated prices. In 2025, Eversource issued 7,130,134 common shares, which resulted in proceeds of $465.4 million, net of issuance costs. Eversource used the net proceeds received for general corporate purposes.

Treasury Shares: As of March 31, 2026 and December 31, 2025, there were 6,879,857 and 7,437,621 Eversource common shares held as treasury shares, respectively. As of March 31, 2026 and December 31, 2025, there were 375,974,644 and 375,416,880 Eversource common shares outstanding, respectively.

Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan. The issuance of treasury shares represents a non-cash transaction, as the treasury shares were used to fulfill Eversource's obligations that require the issuance of common shares.

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

Dividends on the preferred stock of CL&P and NSTAR Electric totaled $1.9 million for each of the three months ended March 31, 2026 and 2025. These dividends were presented as Net Income Attributable to Noncontrolling Interests on the Eversource statements of income. Noncontrolling Interest – Preferred Stock of Subsidiaries on the Eversource balance sheets totaled $155.6 million as of March 31, 2026 and December 31, 2025. On the Eversource balance sheets, Common Shareholders' Equity was fully attributable to Eversource parent and Noncontrolling Interest – Preferred Stock of Subsidiaries was fully attributable to the noncontrolling interest.

- Definition

The entire disclosure for equity.

+ References

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash Balances to Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Restricted Cash and Cash Equivalent Item [Line Items]
Cash as reported on the Balance Sheets	$ 270,200	$ 135,400
Cash and Restricted Cash as reported on the Statements of Cash Flows	337,791	246,245	$ 200,618	$ 127,308
Special Deposits
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	56,200	93,600
Marketable Securities
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	8,200	14,000
Other Long-Term Assets
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	3,200	3,200
CL&P
Restricted Cash and Cash Equivalent Item [Line Items]
Cash as reported on the Balance Sheets	13,000	87,600
Cash and Restricted Cash as reported on the Statements of Cash Flows	14,117	88,676	68,717	2,109
CL&P \| Special Deposits
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	1,100	1,100
CL&P \| Marketable Securities
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	0	0
CL&P \| Other Long-Term Assets
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	0	0
NSTAR Electric
Restricted Cash and Cash Equivalent Item [Line Items]
Cash as reported on the Balance Sheets	190,800	8,300
Cash and Restricted Cash as reported on the Statements of Cash Flows	190,821	25,944	11,103	9,023
NSTAR Electric \| Special Deposits
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	0	17,600
NSTAR Electric \| Marketable Securities
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	0	0
NSTAR Electric \| Other Long-Term Assets
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	0	0
PSNH
Restricted Cash and Cash Equivalent Item [Line Items]
Cash as reported on the Balance Sheets	3,100	13,700
Cash and Restricted Cash as reported on the Statements of Cash Flows	28,549	55,186	$ 30,141	$ 37,243
PSNH \| Special Deposits
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	22,200	38,300
PSNH \| Marketable Securities
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	0	0
PSNH \| Other Long-Term Assets
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash	$ 3,200	$ 3,200

SHORT-TERM AND LONG-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Borrowings Outstanding

The amount of borrowings outstanding and available under the commercial paper programs were as follows:


	Borrowings Outstanding as of				Available Borrowing Capacity as of				Weighted-Average Interest Rate as of
	March 31, 2026		December 31, 2025		March 31, 2026		December 31, 2025		March 31, 2026		December 31, 2025
(Millions of Dollars)
Eversource Parent Commercial Paper Program	$	533.0	$	1,280.0	$	1,467.0	$	720.0	4.08	%	3.98	%
NSTAR Electric Commercial Paper Program	—		245.4		650.0		404.6		—	%	3.87	%

Schedule of Long-Term Debt Issuance and Repayments

The following table summarizes long-term debt issuances and repayments:


(Millions of Dollars)	Interest Rate		Issuance/(Repayment)		Issue Date or Repayment Date	Maturity Date	Use of Proceeds for Issuance/ Repayment Information
Eversource Parent Series A Junior Notes (1)	6.10	%	$	750.0	February 2026	August 2056	Repay Series AA Senior Notes at maturity, repay Series U Senior Notes at maturity, repaid short-term debt, and for general corporate purposes
Eversource Parent Series B Junior Notes (2)	6.35	%	$	750.0	February 2026	August 2056	Repay Series AA Senior Notes at maturity, repay Series U Senior Notes at maturity, repaid short-term debt, and for general corporate purposes
Eversource Parent Series J Senior Notes	3.35	%	$	(250.0)	March 2026	March 2026	Paid at maturity

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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+ Details

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Revenues	$ 4,504,363	$ 4,118,355
Operating Expenses:
Purchased Power and Transmission	1,518,174	1,340,337
Operations and Maintenance	506,980	487,451
Depreciation	420,481	379,579
Energy Efficiency Programs	291,499	257,550
Taxes Other Than Income Taxes	288,317	271,595
Total Operating Expenses	3,428,215	3,191,961
Operating Income	1,076,148	926,394
Interest Expense	365,259	300,849
Other Income, Net	101,159	92,344
Income Before Income Tax Expense	812,048	717,889
Income Tax Expense	203,327	165,221
NSTAR Electric Company
Operating Revenues	1,131,088	1,014,227
Operating Expenses:
Purchased Power and Transmission	310,158	308,946
Operations and Maintenance	196,670	174,137
Depreciation	119,337	108,014
Amortization of Regulatory Assets, Net	74,716	52,284
Energy Efficiency Programs	108,253	63,438
Taxes Other Than Income Taxes	75,709	75,839
Total Operating Expenses	884,843	782,658
Operating Income	246,245	231,569
Interest Expense	80,275	59,220
Other Income, Net	51,684	46,292
Income Before Income Tax Expense	217,654	218,641
Income Tax Expense	51,704	51,466
Net Income	$ 165,950	$ 167,175

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business. Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and EGMA (natural gas utilities), and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.6 million electric, natural gas and water customers through twelve regulated utilities in Connecticut, Massachusetts and New Hampshire. The unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH include the accounts of each of their respective subsidiaries. Intercompany transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH and the unaudited condensed financial statements of CL&P are herein collectively referred to as the "financial statements." The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations. The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2025 Form 10-K, which was filed with the SEC on February 17, 2026. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of March 31, 2026 and December 31, 2025, and the results of operations, comprehensive income, common shareholders' equity and cash flows for the three months ended March 31, 2026 and 2025. The results of operations, comprehensive income and cash flows for the three months ended March 31, 2026 and 2025 are not necessarily indicative of the results expected for a full year. CYAPC and YAEC are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates the operations of CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent. Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements. Eversource's utility subsidiaries' electric, natural gas and water distribution and transmission businesses are subject to rate-regulation that is based on cost recovery and meets the criteria for application of accounting guidance for entities with rate-regulated operations, which considers the effect of regulation on the differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries. See Note 2, "Regulatory Accounting," for further information. On March 25, 2026, upon remand from the Connecticut Superior Court, PURA approved the sale of Aquarion to AWA. The Company evaluated whether Aquarion met the criteria to be classified as held for sale as of March 31, 2026, including whether the sale is considered probable to close within 12 months. Although PURA approved the transaction, legal opposition, including the potential for appeals, introduces significant uncertainty regarding the ultimate timing and consummation of the sale. As a result, the Company cannot assert that the sale of Aquarion is probable and concluded that the held‑for‑sale criteria were not met as of March 31, 2026. Closing of the transaction remains subject to finalization of working capital and other transaction-related adjustments and final closing costs, which could result in a loss recognized either upon meeting held for sale classification and measurement or at the time of sale. Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.
Accounting Standards	Accounting Standards Accounting Standards Issued but Not Yet Adopted: In September 2025, the Financial Accounting Standards Board issued ASU 2025-06, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) - Targeted Improvements to the Accounting for Internal-Use Software, to modernize and clarify the accounting for software costs. The ASU’s provisions change the criteria for capitalization of software development costs by eliminating consideration of “project development stages” and instead requiring consideration of the probability of software project completion for its intended use. The new accounting guidance is effective for interim and annual periods beginning after December 15, 2027, with early adoption permitted. Entities are permitted to apply one of three transition approaches: prospective, modified transition that is based on the status of the project and whether software costs were capitalized before the date of adoption, or retrospective. Eversource is currently reviewing the requirements of ASU 2025-06.
Allowance for Uncollectible Accounts	Allowance for Uncollectible Accounts Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs, and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third-party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables. Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts). The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded. The allowance for uncollectible accounts is determined based upon various judgments and factors, including an aging-based quantitative assessment that applies an estimated uncollectible percentage to each receivable aging category. Factors in determining credit loss include historical collection, write-off experience, analysis of delinquency statistics, and management's assessment of collectability from customers, including current economic conditions, customer payment trends, the impact on customer bills because of energy usage trends and changes in rates, flexible payment plans and financial hardship arrearage management programs offered to customers, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic conditions, collection efforts and other factors. Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible. Management concluded that the reserve balance as of March 31, 2026 adequately reflected the collection risk and net realizable value for its receivables. The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively. The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance. The total allowance for uncollectible accounts is included in Receivables, Net on the balance sheets.
Fair Value Measurements	Fair Value Measurements Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to marketable securities held in trusts. Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, AROs, and in the valuation of business combinations and asset acquisitions. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs. Fair Value Hierarchy: In measuring fair value, Eversource uses observable market data when available in order to minimize the use of unobservable inputs. Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes. The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement. Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis. The levels of the fair value hierarchy are described below: Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable. Level 3 - Quoted market prices are not available. Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable. Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products. Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy. Determination of Fair Value: The valuation techniques and inputs used in Eversource's fair value measurements are described in Note 4, "Derivative Instruments," Note 5, "Marketable Securities," and Note 10, "Fair Value of Financial Instruments," to the financial statements.
Other Taxes	Other TaxesEversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of incomeAs agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References + Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) customer regulatedUtility	Dec. 31, 2025 USD ($)
Summary of Accounting Policies [Line Items]
Number of electric, natural gas and water customers \| customer	4,600,000
Energy Relief Fund - Merrimack Valley Programs
Summary of Accounting Policies [Line Items]
Restricted cash, current \| $	$ 17.4	$ 21.4
CL&P
Summary of Accounting Policies [Line Items]
Period of accounts receivable recoverable under financial or medical duress	180 days
Yankee Gas
Summary of Accounting Policies [Line Items]
Period of accounts receivable recoverable under financial or medical duress	90 days
Connecticut, Massachusetts and New Hampshire
Summary of Accounting Policies [Line Items]
Number of regulated utilities \| regulatedUtility	12

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments

Carrying amounts and estimated fair values are as follows:


	Eversource				CL&P				NSTAR Electric				PSNH
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
As of March 31, 2026:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	128.2	$	116.2	$	94.6	$	43.0	$	33.6	$	—	$	—
Long-Term Debt	29,504.2		28,026.9		5,110.7		4,767.4		5,946.7		5,683.4		2,031.9		1,851.6
Rate Reduction Bonds	302.5		294.3		—		—		—		—		302.5		294.3

As of December 31, 2025:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	126.1	$	116.2	$	92.9	$	43.0	$	33.2	$	—	$	—
Long-Term Debt	28,265.4		27,055.5		5,110.1		4,844.7		5,945.6		5,752.6		2,031.3		1,874.8
Rate Reduction Bonds	324.1		320.2		—		—		—		—		324.1		320.2

REVENUES (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Operating Revenues Disaggregated by Revenue Source

The following tables present operating revenues disaggregated by revenue source:



















	For the Three Months Ended March 31, 2026
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,467.8	$	844.7	$	—	$	32.7	$	—	$	—	$	2,345.2
Commercial	833.1		390.4		—		16.2		—		(3.5)		1,236.2
Industrial	97.7		83.6		—		1.1		—		(6.5)		175.9
Total Retail Tariff Sales Revenues	2,398.6		1,318.7		—		50.0		—		(10.0)		3,757.3
Wholesale Transmission Revenues	—		—		632.3		—		—		(466.3)		166.0
Wholesale Market Sales Revenues	521.2		59.4		—		1.1		—		—		581.7
Other Revenues from Contracts with Customers	20.5		1.6		11.1		0.7		484.4		(485.3)		33.0

Total Revenues from Contracts with Customers	2,940.3		1,379.7		643.4		51.8		484.4		(961.6)		4,538.0
Alternative Revenue Programs	(5.5)		(7.6)		(58.9)		1.6		—		29.7		(40.7)
Other Revenues	5.7		1.1		0.1		0.2		—		—		7.1
Total Operating Revenues	$	2,940.5	$	1,373.2	$	584.6	$	53.6	$	484.4	$	(931.9)	$	4,504.4



















	For the Three Months Ended March 31, 2025
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,489.3	$	696.5	$	—	$	31.4	$	—	$	—	$	2,217.2
Commercial	807.6		305.9		—		15.3		—		(2.0)		1,126.8
Industrial	104.1		67.8		—		1.0		—		(5.9)		167.0
Total Retail Tariff Sales Revenues	2,401.0		1,070.2		—		47.7		—		(7.9)		3,511.0
Wholesale Transmission Revenues	—		—		594.0		—		—		(439.3)		154.7
Wholesale Market Sales Revenues	347.8		62.3		—		1.1		—		—		411.2
Other Revenues from Contracts with Customers	20.8		1.4		3.6		0.6		439.0		(435.8)		29.6

Total Revenues from Contracts with Customers	2,769.6		1,133.9		597.6		49.4		439.0		(883.0)		4,106.5
Alternative Revenue Programs	2.2		6.4		(49.9)		0.6		—		45.2		4.5
Other Revenues	5.9		1.1		0.1		0.3		—		—		7.4
Total Operating Revenues	$	2,777.7	$	1,141.4	$	547.8	$	50.3	$	439.0	$	(837.8)	$	4,118.4




















	For the Three Months Ended March 31, 2026						For the Three Months Ended March 31, 2025
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	787.7	$	471.2	$	208.9	$	801.2	$	506.2	$	181.9
Commercial	304.4		434.5		94.7		344.1		375.7		88.3
Industrial	39.0		34.7		24.0		48.4		30.8		24.9
Total Retail Tariff Sales Revenues	1,131.1		940.4		327.6		1,193.7		912.7		295.1
Wholesale Transmission Revenues	269.2		236.4		126.7		251.1		218.7		124.2
Wholesale Market Sales Revenues	368.7		143.3		9.2		280.0		57.3		10.5
Other Revenues from Contracts with Customers	15.0		13.4		3.7		8.7		11.9		4.3

Total Revenues from Contracts with Customers	1,784.0		1,333.5		467.2		1,733.5		1,200.6		434.1
Alternative Revenue Programs	(32.5)		(16.3)		(15.6)		(18.9)		(9.1)		(19.7)
Other Revenues	2.2		2.4		1.2		2.7		2.4		0.9
Eliminations	(185.6)		(188.5)		(69.3)		(176.1)		(179.7)		(67.3)
Total Operating Revenues	$	1,568.1	$	1,131.1	$	383.5	$	1,541.2	$	1,014.2	$	348.0

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)

3 Months Ended

Mar. 31, 2026

Postemployment Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Expense/(Income)














	Pension and SERP								PBOP
	For the Three Months Ended March 31, 2026								For the Three Months Ended March 31, 2026
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	18.4	$	3.9	$	3.2	$	1.6	$	1.6	$	0.3	$	0.3	$	0.1
Interest Cost	59.1		12.1		12.2		6.2		7.2		1.3		1.9		0.8
Expected Return on Plan Assets	(117.3)		(23.9)		(28.9)		(12.4)		(22.7)		(2.6)		(11.6)		(1.5)
Actuarial Loss/(Gain)	8.7		1.1		2.8		0.4		(0.4)		—		—		—
Prior Service Cost/(Credit)	0.2		—		0.1		—		(5.4)		0.3		(4.2)		0.1

Total Net Periodic Benefit Plan Income	$	(30.9)	$	(6.8)	$	(10.6)	$	(4.2)	$	(19.7)	$	(0.7)	$	(13.6)	$	(0.5)
Intercompany Income Allocations	N/A		$	(1.8)	$	(1.5)	$	(0.5)	N/A		$	(0.6)	$	(0.8)	$	(0.3)













	Pension and SERP								PBOP
	For the Three Months Ended March 31, 2025								For the Three Months Ended March 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	16.4	$	3.8	$	2.5	$	1.6	$	1.6	$	0.2	$	0.2	$	0.1
Interest Cost	63.2		12.8		13.0		6.8		8.0		1.4		2.2		0.8
Expected Return on Plan Assets	(113.3)		(22.9)		(27.7)		(11.9)		(21.2)		(2.4)		(10.5)		(1.4)
Actuarial Loss/(Gain)	10.0		1.2		3.2		0.5		(0.3)		—		—		—
Prior Service Cost/(Credit)	0.3		—		0.1		—		(5.4)		0.3		(4.2)		0.1
Settlement Loss	3.3		—		—		—		—		—		—		—
Total Net Periodic Benefit Plan Income	$	(20.1)	$	(5.1)	$	(8.9)	$	(3.0)	$	(17.3)	$	(0.5)	$	(12.3)	$	(0.4)
Intercompany Expense/(Income) Allocations	N/A		$	0.1	$	0.3	$	0.1	N/A		$	(0.5)	$	(0.7)	$	(0.2)

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Allowance for uncollectible accounts	$ 611,700	$ 580,539
NSTAR Electric
Allowance for uncollectible accounts	$ 127,113	$ 132,561

COMMITMENTS AND CONTINGENCIES - Offshore Wind Sale and Contingent Liability Narrative (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Sep. 30, 2024	Jul. 09, 2024	Mar. 31, 2026	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Equity method investment, liability obligations					$ 365.0
Contingent consideration liability			$ 298.2			$ 448.2
Sunrise Wind, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)		50.00%
Proceeds from sale of equity method investments		$ 118.0
Sunrise Wind, LLC \| Orsted
Schedule of Equity Method Investments [Line Items]
Equity method investment, remaining purchase price paid		$ 34.0
Sunrise Wind, LLC \| Orsted
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)		50.00%
Proceeds from sale of equity method investments		$ 152.0
South Fork Wind And Revolution Wind
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50.00%
Proceeds from sale of equity method investments	$ 745.0
Cost sharing agreement, threshold amount	$ 240.0
Equity method investment, other than temporary impairment, after tax					524.0
Effective income tax rate reconciliation, change in enacted tax rate, amount					$ 60.0
Equity method investment, pre tax charge				$ 284.0
Revolution Wind
Schedule of Equity Method Investments [Line Items]
Federal investment tax credits (percent)			40.00%
Commercial operation, term			4 years

COVER PAGE - shares	3 Months Ended
COVER PAGE - shares	Mar. 31, 2026	Apr. 30, 2026
Document And Entity [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity Registrant Name	EVERSOURCE ENERGY
Entity Incorporation, State or Country Code	MA
Entity Address, Address Line One	300 Cadwell Drive
Entity Address, City or Town	Springfield
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01104
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-05324
Entity Tax Identification Number	04-2147929
Title of 12(b) Security	Common Shares, $5.00 par value per share
Trading Symbol	ES
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		376,080,025
Entity Central Index Key	0000072741
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false
The Connecticut Light and Power Company
Document And Entity [Line Items]
Entity Registrant Name	THE CONNECTICUT LIGHT AND POWER COMPANY
Entity Incorporation, State or Country Code	CT
Entity Address, Address Line One	107 Selden Street
Entity Address, City or Town	Berlin
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06037-1616
City Area Code	800
Local Phone Number	286-5000
Entity File Number	000-00404
Entity Tax Identification Number	06-0303850
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		6,035,205
Entity Central Index Key	0000023426
Current Fiscal Year End Date	--12-31
NSTAR Electric Company
Document And Entity [Line Items]
Entity Registrant Name	NSTAR ELECTRIC COMPANY
Entity Incorporation, State or Country Code	MA
Entity Address, Address Line One	800 Boylston Street
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02199
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-02301
Entity Tax Identification Number	04-1278810
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		200
Entity Central Index Key	0000013372
Current Fiscal Year End Date	--12-31
Public Service Company of New Hampshire
Document And Entity [Line Items]
Entity Registrant Name	PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
Entity Incorporation, State or Country Code	NH
Entity Address, Address Line One	Energy Park
Entity Address, Address Line Two	780 North Commercial Street
Entity Address, City or Town	Manchester
Entity Address, State or Province	NH
Entity Address, Postal Zip Code	03101-1134
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-06392
Entity Tax Identification Number	02-0181050
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		301
Entity Central Index Key	0000315256
Current Fiscal Year End Date	--12-31

SEGMENT INFORMATION - Narrative (Details) $ in Millions	3 Months Ended
SEGMENT INFORMATION - Narrative (Details) $ in Millions	Mar. 31, 2026 USD ($) project reportableSegment
Segment Reporting Information [Line Items]
Number of wind projects \| project	3
Number of reportable segment	1
CL&P
Segment Reporting Information [Line Items]
Number of reportable segment	1
NSTAR Electric
Segment Reporting Information [Line Items]
Number of reportable segment	1
PSNH
Segment Reporting Information [Line Items]
Number of reportable segment	1
Yankee Gas, NSTAR Gas And EGMA
Segment Reporting Information [Line Items]
Natural gas transition service transaction costs \| $	$ 77.7

MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Debt Securities

The following is a summary of available-for-sale debt securities, which are held in CYAPC’s and YAEC’s spent nuclear fuel trusts:


	As of March 31, 2026								As of December 31, 2025
Eversource (Millions of Dollars)	Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value		Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value
Debt Securities	$	151.6	$	1.7	$	(1.4)	$	151.9	$	156.5	$	0.7	$	(1.8)	$	155.4

Schedule of Contractual Maturities of Available-for-Sale Debt Securities

As of March 31, 2026, the contractual maturities of available-for-sale debt securities were as follows:


Eversource (Millions of Dollars)	Amortized Cost		Fair Value
Less than one year	$	11.8	$	12.0
One to five years	45.2		46.0
Six to ten years	22.7		22.9
Greater than ten years	71.9		71.0
Total Debt Securities	$	151.6	$	151.9

Schedule of Marketable Securities Recorded at Fair Value on a Recurring Basis by Level

The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:


Eversource (Millions of Dollars)	As of March 31, 2026		As of December 31, 2025
Level 1:
Mutual Funds and Equities	$	173.3	$	165.3
Money Market Funds	8.2		14.0
Total Level 1	$	181.5	$	179.3
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	82.9	$	82.0
Corporate Debt Securities	38.6		37.9
Asset-Backed Debt Securities	6.1		6.4
Municipal Bonds	7.3		7.2
Other Fixed Income Securities	8.8		7.9
Total Level 2	$	143.7	$	141.4
Total Marketable Securities	$	325.2	$	320.7

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Income	NSTAR Electric	NSTAR Electric Common Stock	NSTAR Electric Capital Surplus, Paid In	NSTAR Electric Retained Earnings	NSTAR Electric Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2024		366,608,052					200
Beginning balance at Dec. 31, 2024	$ 15,039,387	$ 1,878,622	$ 9,428,905	$ 3,929,141	$ (26,472)	$ 6,915,806	$ 0	$ 3,788,842	$ 3,127,105	$ (141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						167,175			167,175
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(276,229)			(276,229)		(436,000)			(436,000)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Loss						(2)				(2)
Ending balance (in shares) at Mar. 31, 2025		367,307,083					200
Ending balance at Mar. 31, 2025	$ 15,341,257	$ 1,878,622	9,440,596	4,203,700	(23,949)	6,746,489	$ 0	3,888,842	2,857,790	(143)
Beginning balance (in shares) at Dec. 31, 2025	375,416,880	375,416,880					200
Beginning balance at Dec. 31, 2025	$ 16,197,271	$ 1,914,273	9,937,878	4,504,983	(20,507)	7,558,835	$ 0	4,238,842	3,319,768	225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						165,950			165,950
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	$ (295,978)			(295,978)
Capital Contributions from Eversource Parent						258,000		258,000
Other Comprehensive Loss						(27)				(27)
Ending balance (in shares) at Mar. 31, 2026	375,974,644	375,974,644					200
Ending balance at Mar. 31, 2026	$ 16,530,950	$ 1,914,273	$ 9,950,113	$ 4,815,846	$ (20,377)	$ 7,982,268	$ 0	$ 4,496,842	$ 3,485,228	$ 198

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

+ Details

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Impact of Funding on the Income Statements (Details) - PSNH - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Condensed Income Statements, Captions [Line Items]
Amortization of Regulatory Assets, Net	$ 26,650	$ 20,835
VIE \| Rate Reduction Bonds
Condensed Income Statements, Captions [Line Items]
Amortization of Regulatory Assets, Net	10,800	10,800
Interest Expense on RRB Principal (included in Interest Expense)	$ 2,900	$ 3,300

- Definition

Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 49
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-24

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483013/835-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

+ Details

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES (Tables)

3 Months Ended

Mar. 31, 2026

Rate Reduction Bonds and Variable Interest Entity [Abstract]

Schedule of the Impact of Funding on the Balance Sheets and Income Statements

The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements:


(Millions of Dollars)
PSNH Balance Sheets:	As of March 31, 2026		As of December 31, 2025
Restricted Cash - Current Portion (included in Special Deposits)	$	18.4	$	30.6
Restricted Cash - Long-Term Portion (included in Other Long-Term Assets)	3.2		3.2
Securitized Stranded Cost (included in Regulatory Assets)	295.3		306.1
Other Regulatory Liabilities (included in Regulatory Liabilities)	9.1		7.3
Accrued Interest (included in Other Current Liabilities)	1.9		5.1
Rate Reduction Bonds - Current Portion	43.2		43.2
Rate Reduction Bonds - Long-Term Portion	259.3		280.9


(Millions of Dollars) PSNH Income Statements:	For the Three Months Ended
	March 31, 2026		March 31, 2025
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	$	10.8	$	10.8
Interest Expense on RRB Principal (included in Interest Expense)	2.9		3.3

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Revenues	$ 4,504,363	$ 4,118,355
Operating Expenses:
Purchased Power and Transmission	1,518,174	1,340,337
Operations and Maintenance	506,980	487,451
Depreciation	420,481	379,579
Energy Efficiency Programs	291,499	257,550
Taxes Other Than Income Taxes	288,317	271,595
Total Operating Expenses	3,428,215	3,191,961
Operating Income	1,076,148	926,394
Interest Expense	365,259	300,849
Other Income, Net	101,159	92,344
Income Before Income Tax Expense	812,048	717,889
Income Tax Expense	203,327	165,221
PSNH
Operating Revenues	383,517	347,981
Operating Expenses:
Purchased Power and Transmission	89,195	80,007
Operations and Maintenance	61,540	71,009
Depreciation	44,439	40,502
Amortization of Regulatory Assets, Net	26,650	20,835
Energy Efficiency Programs	10,489	12,202
Taxes Other Than Income Taxes	27,285	25,789
Total Operating Expenses	259,598	250,344
Operating Income	123,919	97,637
Interest Expense	28,617	20,569
Other Income, Net	10,502	10,758
Income Before Income Tax Expense	105,804	87,826
Income Tax Expense	26,027	21,547
Net Income	$ 79,777	$ 66,279

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

SEGMENT INFORMATION

Eversource is organized into the Electric Distribution, Electric Transmission, Natural Gas Distribution and Water Distribution reportable segments and Other based on a combination of factors, including the characteristics of each segments' services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates. The Electric Distribution segment consists of the rate-regulated distribution businesses of CL&P, NSTAR Electric and PSNH, and includes the results of NSTAR Electric's solar power facilities. The Electric Transmission segment consists of the rate-regulated electric transmission businesses of CL&P, NSTAR Electric and PSNH. The Natural Gas Distribution segment consists of the rate-regulated businesses of Yankee Gas, NSTAR Gas and EGMA. The Water Distribution segment consists of the rate-regulated business of Aquarion. These reportable segments represent substantially all of Eversource's total consolidated revenues. Revenues from the sale of electricity, natural gas and water primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer.

Eversource's reportable segments are determined based upon the level at which Eversource's chief operating decision maker assesses performance and makes decisions about the allocation of company resources. The chief operating decision maker uses the net income of each reportable segment to evaluate return generated from assets and decide how to reinvest profits and allocate resources, to monitor budget-to-actual results, in the planning and forecasting process, in determining compensation achievement, and in benchmarking to Eversource’s peers. Eversource’s chief operating decision maker is its chief executive officer. The accounting policies of the segments are the same as those described in the summary of significant accounting policies.

The remainder of Eversource's operations is presented as Other in the tables below and primarily consists of 1) the equity in earnings of Eversource parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest expense related to the debt of Eversource parent, 2) the revenues and expenses of Eversource Service, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, 4) the results of other unregulated subsidiaries, which are not part of its core business, and 5) Eversource parent's equity ownership interests that are not consolidated, which primarily included the offshore wind investments until sale of the three offshore wind projects in 2024 and a natural gas pipeline owned by Enbridge, Inc.

In the ordinary course of business, Yankee Gas, NSTAR Gas and EGMA purchase natural gas transmission services from the Enbridge, Inc. natural gas pipeline project described above. These affiliate transaction costs total $77.7 million annually and are classified as Purchased Power, Purchased Natural Gas and Transmission on the Eversource statements of income.

Each of Eversource's subsidiaries, including CL&P, NSTAR Electric and PSNH, has one reportable segment.

Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred on capital projects but not yet paid, cost of removal, AFUDC related to equity funds, and the capitalized and deferred portions of pension and PBOP income/expense. Eversource's segment information is as follows:

























	For the Three Months Ended March 31, 2026
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,940.5	$	1,373.2	$	584.6	$	53.6	$	484.4	$	(931.9)	$	4,504.4
Depreciation and Amortization	(541.7)		(97.5)		(115.2)		(12.4)		(60.6)		4.1		(823.3)
Operations and Maintenance (1)
Operations, Excluding Storm Costs	(106.9)		(50.7)		(34.7)
Corporate Shared Services	(121.6)		(30.4)		(21.7)
Storm Costs	(28.9)		—		—
Employee Benefits	(39.1)		(20.9)		(11.7)
Uncollectible Expense	(35.6)		(33.5)		—
Other	(31.3)		(0.3)		(16.3)
Total Operations and Maintenance	(363.4)		(135.8)		(84.4)		(22.7)		(391.8)		491.1		(507.0)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2)	(1,735.0)		(717.9)		(74.1)		(6.9)		(0.8)		436.7		(2,098.0)
Operating Income	300.4		422.0		310.9		11.6		31.2		—		1,076.1
Interest Expense	(100.0)		(34.0)		(83.1)		(7.2)		(180.2)		39.2		(365.3)

Interest Income	20.5		7.8		0.1		—		39.2		(39.2)		28.4
Other Income, Net	45.0		6.7		14.2		1.7		692.2		(687.0)		72.8
Income Tax (Expense)/Benefit	(61.9)		(107.2)		(61.0)		0.3		26.5		—		(203.3)
Net Income	204.0		295.3		181.1		6.4		608.9		(687.0)		608.7
Net Income Attributable to Noncontrolling Interests	(1.2)		—		(0.7)		—		—		—		(1.9)
Net Income Attributable to Common Shareholders	$	202.8	$	295.3	$	180.4	$	6.4	$	608.9	$	(687.0)	$	606.8
Cash Flows Used for Investments in Plant	$	458.9	$	152.1	$	281.7	$	30.8	$	85.8	$	—	$	1,009.3

























	For the Three Months Ended March 31, 2025
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,777.7	$	1,141.4	$	547.8	$	50.3	$	439.0	$	(837.8)	$	4,118.4
Depreciation and Amortization	(564.7)		(104.5)		(106.8)		(11.2)		(50.6)		2.8		(835.0)
Operations and Maintenance (1)
Operations, Excluding Storm Costs	(101.7)		(46.2)		(31.5)
Corporate Shared Services	(116.4)		(30.3)		(21.8)
Storm Costs	(19.9)		—		—
Employee Benefits	(48.6)		(18.6)		(11.7)
Uncollectible Expense	(43.7)		(30.0)		—
Other	(27.4)		2.1		(10.9)
Total Operations and Maintenance	(357.7)		(123.0)		(75.9)		(22.8)		(349.1)		441.0		(487.5)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2)	(1,580.6)		(605.2)		(69.6)		(6.8)		(1.4)		394.1		(1,869.5)
Operating Income	274.7		308.7		295.5		9.5		37.9		0.1		926.4
Interest Expense	(91.1)		(28.4)		(38.6)		(7.7)		(178.4)		43.4		(300.8)

Interest Income	27.3		6.7		—		—		43.4		(43.4)		34.0
Other Income, Net	35.3		5.5		12.1		0.8		625.7		(621.1)		58.3
Income Tax (Expense)/Benefit	(56.6)		(74.1)		(68.9)		1.0		33.4		—		(165.2)
Net Income	189.6		218.4		200.1		3.6		562.0		(621.0)		552.7
Net Income Attributable to Noncontrolling Interests	(1.2)		—		(0.7)		—		—		—		(1.9)
Net Income Attributable to Common Shareholders	$	188.4	$	218.4	$	199.4	$	3.6	$	562.0	$	(621.0)	$	550.8
Cash Flows Used for Investments in Plant	$	489.6	$	193.9	$	244.8	$	28.5	$	50.6	$	—	$	1,007.4

(1) The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker. Costs of the operations organization include labor and overtime, outside services, vehicles, vegetation management, employee expenses, fees and payments, regulatory assessments, and materials, partially offset by reimbursements. Corporate shared services include corporate centralized functions. Costs within these corporate functions primarily include labor, services by vendors, fees and payments, insurance, and regulatory assessments. Other includes information technology system depreciation at Eversource Service charged to the operating businesses, as well as storm funding, capitalization and various other corporate costs. The segment-level operating expense for information technology system depreciation is eliminated and reflected in depreciation in Eversource’s consolidation.

For the water distribution segment, the chief operating decision maker is provided with total operations and maintenance expense information to manage its operations. Operations and maintenance expenses primarily include employee costs, benefits, and outside services.

(2) Other segment line items for the electric distribution, electric transmission and natural gas distribution segments primarily include purchased power, purchased natural gas and transmission, taxes other than income taxes including property, payroll-related and Connecticut gross earnings taxes, and energy efficiency program expenses. Other segment line items for the water distribution business primarily include taxes other than income taxes.

The following table summarizes Eversource's segmented total assets:


Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
As of March 31, 2026	$	35,382.0	$	10,919.0	$	17,227.4	$	2,990.3	$	30,549.2	$	(32,360.3)	$	64,707.6
As of December 31, 2025	34,858.1		10,865.5		17,193.9		2,977.6		29,743.3		(31,851.7)		63,786.7

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

Schedule of Allowance for Uncollectible Accounts

The activity in the allowance for uncollectible accounts by portfolio segment as of March 31st is as follows:


	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other		Total Allowance		Total Allowance








Balance as of January 1, 2026	$	367.2	$	213.3	$	580.5	$	225.7	$	32.8	$	258.5	$	60.7	$	71.9	$	132.6	$	23.5
Uncollectible Expense	—		30.8		30.8		—		5.5		5.5		—		8.3		8.3		1.4
Uncollectible Costs Deferred (1)	27.8		18.8		46.6		22.1		2.8		24.9		(3.5)		7.4		3.9		2.2
Write-Offs	(12.2)		(38.5)		(50.7)		(9.5)		(6.9)		(16.4)		(0.6)		(18.6)		(19.2)		(3.1)
Recoveries Collected	0.4		4.1		4.5		0.3		1.2		1.5		—		1.5		1.5		0.3

Balance as of March 31, 2026	$	383.2	$	228.5	$	611.7	$	238.6	$	35.4	$	274.0	$	56.6	$	70.5	$	127.1	$	24.3











Balance as of January 1, 2025	$	364.6	$	191.6	$	556.2	$	240.7	$	38.4	$	279.1	$	55.2	$	59.7	$	114.9	$	14.1
Uncollectible Expense	—		22.9		22.9		—		4.7		4.7		—		7.5		7.5		1.3
Uncollectible Costs Deferred (1)	19.4		13.8		33.2		8.8		1.9		10.7		3.5		5.5		9.0		1.4
Write-Offs	(12.6)		(37.8)		(50.4)		(9.3)		(10.1)		(19.4)		(0.9)		(15.9)		(16.8)		(2.7)
Recoveries Collected	0.1		3.6		3.7		0.1		1.0		1.1		—		1.4		1.4		0.2
Balance as of March 31, 2025	$	371.5	$	194.1	$	565.6	$	240.3	$	35.9	$	276.2	$	57.8	$	58.2	$	116.0	$	14.3

(1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to uncollectible energy supply costs.

Schedule of Components of Other Income, Net

The components of Other Income, Net on the statements of income were as follows:














	For the Three Months Ended
	March 31, 2026								March 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion	$	44.2	$	11.9	$	19.0	$	5.2	$	32.6	$	8.3	$	14.8	$	4.1
AFUDC Equity	23.9		4.6		15.7		2.3		23.9		3.6		14.1		3.9
Equity in Earnings of Unconsolidated Affiliates	3.8		—		0.1		—		6.0		—		0.2		—
Investment Income/(Loss)	0.3		(0.1)		0.4		—		(2.0)		0.1		(1.8)		0.1
Interest Income	28.4		1.2		16.4		3.0		34.0		5.6		19.0		2.7

Other	0.6		—		0.1		—		(2.2)		—		—		—
Total Other Income, Net	$	101.2	$	17.6	$	51.7	$	10.5	$	92.3	$	17.6	$	46.3	$	10.8

Schedule of Other Taxes

These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:


	For the Three Months Ended
(Millions of Dollars)		March 31, 2026		March 31, 2025
Eversource		$	68.1	$	63.7
CL&P		52.9		52.9

Schedule of Non-Cash Investing Activities

Non-cash investing activities include plant additions included in Accounts Payable as follows:


(Millions of Dollars)	As of March 31, 2026		As of March 31, 2025
Eversource	$	346.5	$	427.2
CL&P	113.8		82.3
NSTAR Electric	117.1		172.8
PSNH	39.1		58.2

Schedule of Reconciliation of Cash Balances to Cash and Restricted Cash

The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:


	As of March 31, 2026								As of December 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Cash as reported on the Balance Sheets	$	270.2	$	13.0	$	190.8	$	3.1	$	135.4	$	87.6	$	8.3	$	13.7
Restricted cash included in:
Special Deposits	56.2		1.1		—		22.2		93.6		1.1		17.6		38.3

Marketable Securities	8.2		—		—		—		14.0		—		—		—
Other Long-Term Assets	3.2		—		—		3.2		3.2		—		—		3.2
Cash and Restricted Cash as reported on the Statements of Cash Flows	$	337.8	$	14.1	$	190.8	$	28.5	$	246.2	$	88.7	$	25.9	$	55.2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	$ 155,568	$ 155,568
Rate Reduction Bonds	259,257	280,862
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	155,600	155,600
Long-Term Debt	29,504,200	28,265,400
Rate Reduction Bonds	302,500	324,100
Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	128,200	126,100
Long-Term Debt	28,026,900	27,055,500
Rate Reduction Bonds	294,300	320,200
CL&P
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
CL&P \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
Long-Term Debt	5,110,700	5,110,100
Rate Reduction Bonds	0	0
CL&P \| Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	94,600	92,900
Long-Term Debt	4,767,400	4,844,700
Rate Reduction Bonds	0	0
NSTAR Electric
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
NSTAR Electric \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Long-Term Debt	5,946,700	5,945,600
Rate Reduction Bonds	0	0
NSTAR Electric \| Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	33,600	33,200
Long-Term Debt	5,683,400	5,752,600
Rate Reduction Bonds	0	0
PSNH
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate Reduction Bonds	259,257	280,862
PSNH \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	0	0
Long-Term Debt	2,031,900	2,031,300
Rate Reduction Bonds	302,500	324,100
PSNH \| Fair Value \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	0	0
Long-Term Debt	1,851,600	1,874,800
Rate Reduction Bonds	$ 294,300	$ 320,200

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	$ 420,481	$ 379,579
Deferred Income Taxes	81,402	(56,524)
Uncollectible Expense	30,795	22,863
Pension, SERP and PBOP Income, Net	(28,287)	(18,811)
Regulatory Over Recoveries, Net	126,339	84,461
Cost of Removal Expenditures	(41,385)	(67,151)
Other	28,255	15,840
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(264,738)	(288,984)
Taxes Receivable/Accrued, Net	247,015	288,790
Accounts Payable	(145,387)	(131,367)
Other Current Assets and Liabilities, Net	(141,649)	(196,218)
Net Cash Flows Provided by Operating Activities	1,324,326	1,040,595
Investing Activities:
Investments in Property, Plant and Equipment	(1,009,311)	(1,007,384)
Net Cash Flows Used in Investing Activities	(1,149,943)	(999,230)
Financing Activities:
Cash Dividends on Common Stock	(290,023)	(270,232)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
Issuance of Long-Term Debt	1,502,574	1,201,407
Decrease in Notes Payable	(992,445)	(552,694)
Other Financing Activities	(29,342)	(23,000)
Net Cash Flows (Used In)/Provided by Financing Activities	(82,837)	31,945
Net (Decrease)/Increase in Cash and Restricted Cash	91,546	73,310
Cash and Restricted Cash - Beginning of Period	246,245	127,308
Cash and Restricted Cash - End of Period	337,791	200,618
NSTAR Electric
Operating Activities:
Net Income	165,950	167,175
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	119,337	108,014
Deferred Income Taxes	12,431	(10,197)
Uncollectible Expense	8,299	7,485
Pension, SERP and PBOP Income, Net	(11,511)	(10,161)
Regulatory Over Recoveries, Net	67,682	78,429
Amortization of Regulatory Assets, Net	74,716	52,284
Cost of Removal Expenditures	(6,092)	(16,903)
Other	(22,321)	(7,333)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	111,590	(114,975)
Taxes Receivable/Accrued, Net	54,123	78,295
Accounts Payable	(50,973)	3,771
Other Current Assets and Liabilities, Net	11,458	(24,456)
Net Cash Flows Provided by Operating Activities	534,689	311,428
Investing Activities:
Investments in Property, Plant and Equipment	(381,725)	(367,462)
Net Cash Flows Used in Investing Activities	(381,725)	(367,462)
Financing Activities:
Cash Dividends on Common Stock	0	(436,000)
Cash Dividends on Preferred Stock	(490)	(490)
Issuance of Long-Term Debt	0	800,000
Capital Contributions from Eversource Parent	258,000	100,000
Decrease in Notes Payable	(245,445)	(396,282)
Other Financing Activities	(152)	(9,114)
Net Cash Flows (Used In)/Provided by Financing Activities	11,913	58,114
Net (Decrease)/Increase in Cash and Restricted Cash	164,877	2,080
Cash and Restricted Cash - Beginning of Period	25,944	9,023
Cash and Restricted Cash - End of Period	$ 190,821	$ 11,103

MARKETABLE SECURITIES

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

MARKETABLE SECURITIES

Eversource’s marketable securities include the CYAPC and YAEC legally restricted trusts that each hold equity and available-for-sale debt securities to fund the spent nuclear fuel removal obligations of their nuclear fuel storage facilities. Equity and available-for-sale debt marketable securities are recorded at fair value. CYAPC and YAEC’s spent nuclear fuel trusts are restricted and are classified in long-term Marketable Securities on the balance sheets.

Equity Securities: Eversource's equity securities include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $170.4 million and $161.8 million as of March 31, 2026 and December 31, 2025, respectively. Unrealized gains and losses for these spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income.

Eversource’s water business also holds a trust. As of March 31, 2026 and December 31, 2025, the securities held in this trust of $2.9 million and $3.5 million were classified as Marketable Securities on the Eversource balance sheet, respectively. There were unrealized losses of $0.6 million and $0.3 million for the three months ended March 31, 2026 and 2025, respectively, recorded in Other Income, Net, related to these equity securities.

Available-for-Sale Debt Securities: The following is a summary of available-for-sale debt securities, which are held in CYAPC’s and YAEC’s spent nuclear fuel trusts:


	As of March 31, 2026								As of December 31, 2025
Eversource (Millions of Dollars)	Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value		Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value
Debt Securities	$	151.6	$	1.7	$	(1.4)	$	151.9	$	156.5	$	0.7	$	(1.8)	$	155.4

Unrealized gains and losses for available-for-sale debt securities included in the CYAPC and YAEC spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income.

As of March 31, 2026, the contractual maturities of available-for-sale debt securities were as follows:


Eversource (Millions of Dollars)	Amortized Cost		Fair Value
Less than one year	$	11.8	$	12.0
One to five years	45.2		46.0
Six to ten years	22.7		22.9
Greater than ten years	71.9		71.0
Total Debt Securities	$	151.6	$	151.9

Realized Gains and Losses: Realized gains and losses are offset in long-term liabilities for CYAPC and YAEC and are recorded in Other Income, Net for Eversource's benefit trusts. Eversource utilizes the average cost basis method for the CYAPC and YAEC spent nuclear fuel trusts.

Fair Value Measurements: The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:


Eversource (Millions of Dollars)	As of March 31, 2026		As of December 31, 2025
Level 1:
Mutual Funds and Equities	$	173.3	$	165.3
Money Market Funds	8.2		14.0
Total Level 1	$	181.5	$	179.3
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	82.9	$	82.0
Corporate Debt Securities	38.6		37.9
Asset-Backed Debt Securities	6.1		6.4
Municipal Bonds	7.3		7.2
Other Fixed Income Securities	8.8		7.9
Total Level 2	$	143.7	$	141.4
Total Marketable Securities	$	325.2	$	320.7

U.S. government issued debt securities are valued using market approaches that incorporate transactions for the same or similar bonds and adjustments for yields and maturity dates. Corporate debt securities are valued using a market approach, utilizing recent trades of the same or similar instruments and also incorporating yield curves, credit spreads and specific bond terms and conditions. Asset-backed debt securities include collateralized mortgage obligations, commercial mortgage backed securities, and securities collateralized by auto loans, credit card loans or receivables. Asset-backed debt securities are valued using recent trades of similar instruments, prepayment assumptions, yield curves, issuance and maturity dates, and tranche information. Municipal bonds are valued using a market approach that incorporates reported trades and benchmark yields. Other fixed income securities are valued using pricing models, quoted prices of securities with similar characteristics, and discounted cash flows.

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Noncontrolling Interest [Line Items]
Dividends on preferred stock	$ 1,880	$ 1,880
Noncontrolling interest attributed to preferred stock of subsidiaries	155,568		$ 155,568
CL&P and NSTAR
Noncontrolling Interest [Line Items]
Dividends on preferred stock	$ 1,900	$ 1,900

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Other Comprehensive Loss, Net of Tax:
Comprehensive Income Attributable to Common Shareholders	$ 606,971	$ 553,311
The Connecticut Light and Power Company
Net Income	139,329	156,236
Other Comprehensive Loss, Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)	(6)
Other Comprehensive Loss, Net of Tax	(7)	(6)
Comprehensive Income Attributable to Common Shareholders	$ 139,322	$ 156,230

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 7,665,400	$ 7,693,700
Less: Current Portion	1,897,191	1,975,083
Total Long-Term Regulatory Assets	5,768,159	5,718,646
Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	2,100,400	1,959,300
Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	1,540,300	1,573,800
Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	1,051,000	1,044,500
Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	984,900	992,800
Derivative Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	636,200	753,200
Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	295,300	306,100
Cost of Removal
Regulatory Assets [Line Items]
Total Regulatory Assets	267,500	262,500
Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	226,200	230,400
Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	166,000	162,800
Environmental Remediation Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	134,200	136,100
EGMA Acquisition and Integration Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	82,300	82,300
Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	181,100	189,900
CL&P
Regulatory Assets [Line Items]
Total Regulatory Assets	1,985,400	1,981,400
Less: Current Portion	235,015	265,175
Total Long-Term Regulatory Assets	1,750,400	1,716,212
CL&P \| Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	1,028,900	991,300
CL&P \| Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	172,700	206,500
CL&P \| Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	547,000	546,100
CL&P \| Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	172,500	173,700
CL&P \| Derivative Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	0	100
CL&P \| Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| Cost of Removal
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	44,900	44,200
CL&P \| Environmental Remediation Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| EGMA Acquisition and Integration Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P \| Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	19,400	19,500
NSTAR Electric
Regulatory Assets [Line Items]
Total Regulatory Assets	2,824,500	2,802,300
Less: Current Portion	1,018,886	978,754
Total Long-Term Regulatory Assets	1,805,604	1,823,522
NSTAR Electric \| Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	602,700	499,600
NSTAR Electric \| Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	749,700	705,600
NSTAR Electric \| Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	165,900	161,500
NSTAR Electric \| Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	297,100	300,000
NSTAR Electric \| Derivative Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	636,200	753,100
NSTAR Electric \| Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric \| Cost of Removal
Regulatory Assets [Line Items]
Total Regulatory Assets	8,100	8,100
NSTAR Electric \| Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	194,200	197,800
NSTAR Electric \| Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	86,100	84,600
NSTAR Electric \| Environmental Remediation Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric \| EGMA Acquisition and Integration Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric \| Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	84,500	92,000
PSNH
Regulatory Assets [Line Items]
Total Regulatory Assets	971,900	961,100
Less: Current Portion	101,449	119,871
Total Long-Term Regulatory Assets	870,534	841,203
PSNH \| Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	468,800	468,400
PSNH \| Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	115,900	93,200
PSNH \| Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	22,400	23,300
PSNH \| Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	61,300	61,700
PSNH \| Derivative Contracts
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	295,300	306,100
PSNH \| Cost of Removal
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	5,500	5,400
PSNH \| Environmental Remediation Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| EGMA Acquisition and Integration Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH \| Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 2,700	$ 3,000

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION - Components of Net Periodic Benefit Expense/(Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 18.4	$ 16.4
Interest Cost	59.1	63.2
Expected Return on Plan Assets	(117.3)	(113.3)
Actuarial Loss/(Gain)	8.7	10.0
Prior Service Cost/(Credit)	0.2	0.3
Settlement Loss		3.3
Total Net Periodic Benefit Plan Income	(30.9)	(20.1)
PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.6	1.6
Interest Cost	7.2	8.0
Expected Return on Plan Assets	(22.7)	(21.2)
Actuarial Loss/(Gain)	(0.4)	(0.3)
Prior Service Cost/(Credit)	(5.4)	(5.4)
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(19.7)	(17.3)
CL&P \| Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	3.9	3.8
Interest Cost	12.1	12.8
Expected Return on Plan Assets	(23.9)	(22.9)
Actuarial Loss/(Gain)	1.1	1.2
Prior Service Cost/(Credit)	0.0	0.0
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(6.8)	(5.1)
Intercompany Income Allocations	(1.8)	0.1
CL&P \| PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.2
Interest Cost	1.3	1.4
Expected Return on Plan Assets	(2.6)	(2.4)
Actuarial Loss/(Gain)	0.0	0.0
Prior Service Cost/(Credit)	0.3	0.3
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(0.7)	(0.5)
Intercompany Income Allocations	(0.6)	(0.5)
NSTAR Electric \| Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	3.2	2.5
Interest Cost	12.2	13.0
Expected Return on Plan Assets	(28.9)	(27.7)
Actuarial Loss/(Gain)	2.8	3.2
Prior Service Cost/(Credit)	0.1	0.1
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(10.6)	(8.9)
Intercompany Income Allocations	(1.5)	0.3
NSTAR Electric \| PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.2
Interest Cost	1.9	2.2
Expected Return on Plan Assets	(11.6)	(10.5)
Actuarial Loss/(Gain)	0.0	0.0
Prior Service Cost/(Credit)	(4.2)	(4.2)
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(13.6)	(12.3)
Intercompany Income Allocations	(0.8)	(0.7)
PSNH \| Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.6	1.6
Interest Cost	6.2	6.8
Expected Return on Plan Assets	(12.4)	(11.9)
Actuarial Loss/(Gain)	0.4	0.5
Prior Service Cost/(Credit)	0.0	0.0
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(4.2)	(3.0)
Intercompany Income Allocations	(0.5)	0.1
PSNH \| PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.1	0.1
Interest Cost	0.8	0.8
Expected Return on Plan Assets	(1.5)	(1.4)
Actuarial Loss/(Gain)	0.0	0.0
Prior Service Cost/(Credit)	0.1	0.1
Settlement Loss		0.0
Total Net Periodic Benefit Plan Income	(0.5)	(0.4)
Intercompany Income Allocations	$ (0.3)	$ (0.2)

COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications Narrative (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2024	Jul. 09, 2024
Guarantor Obligations [Line Items]
Fair value of guarantees	$ 1,200,000	$ 1,300,000
Maximum exposure (up to)			$ 850,000,000
Letters of Credit \| Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum borrowing capacity	25,000,000
Amount outstanding under line of credit	$ 0
South Fork Wind And Revolution Wind
Guarantor Obligations [Line Items]
Ownership interest (percent)			50.00%
Sunrise Wind, LLC
Guarantor Obligations [Line Items]
Ownership interest (percent)				50.00%

COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Schedule of Environmental Loss Contingencies by Site

The number of environmental sites and related reserves for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows:


	As of March 31, 2026			As of December 31, 2025
	Number of Sites	Reserve (in millions)		Number of Sites	Reserve (in millions)
Eversource	67	$	154.1	66	$	154.3
CL&P	15	15.8		15	14.9
NSTAR Electric	15	7.0		14	7.0
PSNH	8	9.2		8	9.2

Schedule of Exposure to Guarantees and Indemnifications

As of March 31, 2026

Company (Obligor)

Description

Maximum Exposure
(in millions)

Revolution Wind, LLC and TurbineCo, LLC

Offshore wind construction-related purchase agreements with third-party contractors (1)

122.3

Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC

Offshore wind funding and indemnification obligations (2)

143.0

Eversource Investment LLC

Revolution Wind Tax Positions (3)

300.0

Eversource TEI LLC

South Fork Wind Tax Equity (4)

50.0

South Fork Wind, LLC

Power Purchase Agreement Security (5)

7.1

Various Eversource subsidiaries

Surety bonds (6)

34.1

REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 6,063,600	$ 5,538,100
Less: Current Portion	1,739,987	1,264,609
Total Long-Term Regulatory Liabilities	4,323,619	4,273,465
EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,407,800	2,423,400
Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,578,200	1,186,600
Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	917,700	867,100
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	534,500	509,400
AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	187,300	179,400
Derivative Contract
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	131,200	91,000
Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	74,900	80,400
Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	232,000	200,800
CL&P
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,104,300	1,862,600
Less: Current Portion	635,307	417,498
Total Long-Term Regulatory Liabilities	1,468,970	1,445,140
CL&P \| EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	928,600	933,300
CL&P \| Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	661,800	457,300
CL&P \| Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	297,500	275,100
CL&P \| Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	76,200	72,800
CL&P \| AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	74,700	72,000
CL&P \| Derivative Contract
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
CL&P \| Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	9,100	8,800
CL&P \| Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	56,400	43,300
NSTAR Electric
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,557,800	2,352,900
Less: Current Portion	835,408	650,813
Total Long-Term Regulatory Liabilities	1,722,355	1,702,059
NSTAR Electric \| EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	841,200	847,900
NSTAR Electric \| Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	648,200	535,200
NSTAR Electric \| Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	498,000	479,400
NSTAR Electric \| Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	264,700	252,500
NSTAR Electric \| AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	112,600	107,400
NSTAR Electric \| Derivative Contract
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	131,200	91,000
NSTAR Electric \| Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	20,200	24,500
NSTAR Electric \| Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	41,700	15,000
PSNH
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	559,200	535,800
Less: Current Portion	134,115	118,443
Total Long-Term Regulatory Liabilities	425,128	417,442
PSNH \| EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	317,300	319,800
PSNH \| Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	125,500	111,200
PSNH \| Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	54,600	45,500
PSNH \| Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	50,900	48,500
PSNH \| AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH \| Derivative Contract
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH \| Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	6,900	6,800
PSNH \| Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 4,000	$ 4,000

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax

The changes in accumulated other comprehensive income/(loss) by component, net of tax, are as follows:


	For the Three Months Ended March 31, 2026						For the Three Months Ended March 31, 2025
Eversource (Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Defined Benefit Plans		Total		Qualified Cash Flow Hedging Instruments		Defined Benefit Plans		Total
Balance as of Beginning of Period	$	(0.4)	$	(20.1)	$	(20.5)	$	(0.4)	$	(26.1)	$	(26.5)


Amounts Reclassified from AOCI	—		0.1		0.1		—		2.5		2.5
Net OCI	—		0.1		0.1		—		2.5		2.5
Balance as of End of Period	$	(0.4)	$	(20.0)	$	(20.4)	$	(0.4)	$	(23.6)	$	(24.0)

COMMON SHARES (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Common Shares Authorized and Issued


	Shares
			Authorized as of March 31, 2026 and December 31, 2025	Issued as of
	Par Value			March 31, 2026	December 31, 2025
Eversource	$	5	410,000,000	382,854,501	382,854,501
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(27))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-4

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-5

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481142/505-10-45-2

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-10

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-8

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
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-Name Accounting Standards Codification
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

+ Details

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash	$ 270,184	$ 135,351
Receivables, Net (net of allowance for uncollectible accounts)	2,080,805	1,847,094
Unbilled Revenues	217,605	275,108
Materials, Supplies, Natural Gas and REC Inventory	489,415	491,592
Regulatory Assets	1,897,191	1,975,083
Prepayments and Other Current Assets	389,535	352,958
Total Current Assets	5,344,735	5,077,186
Property, Plant and Equipment, Net	46,470,244	45,930,959
Deferred Debits and Other Assets:
Regulatory Assets	5,768,159	5,718,646
Goodwill	4,233,767	4,233,767
Prepaid Pension and PBOP	1,566,418	1,511,169
Marketable Securities	322,189	317,101
Other Long-Term Assets	1,002,089	997,883
Total Deferred Debits and Other Assets	12,892,622	12,778,566
Total Assets	64,707,601	63,786,711
Current Liabilities:
Notes Payable	533,000	1,525,445
Long-Term Debt – Current Portion	2,643,097	1,392,948
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,662,046	1,859,692
Regulatory Liabilities	1,739,987	1,264,609
Offshore Wind Contingent Liability	298,157	448,158
Other Current Liabilities	1,290,226	1,274,450
Total Current Liabilities	8,209,723	7,808,512
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,894,583	5,647,218
Regulatory Liabilities	4,323,619	4,273,465
Derivative Liabilities	636,179	753,149
Asset Retirement Obligations	597,713	595,442
Accrued SERP and PBOP	100,531	100,859
Other Long-Term Liabilities	1,138,347	1,101,932
Total Deferred Credits and Other Liabilities	12,690,972	12,472,065
Long-Term Debt	26,861,131	26,872,433
Rate Reduction Bonds	259,257	280,862
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,568	155,568
Common Shareholders' Equity:
Common Shares	1,914,273	1,914,273
Capital Surplus, Paid In	9,950,113	9,937,878
Retained Earnings	4,815,846	4,504,983
Accumulated Other Comprehensive Income (Loss)	(20,377)	(20,507)
Treasury Stock	(128,905)	(139,356)
Common Shareholders' Equity	16,530,950	16,197,271
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 64,707,601	$ 63,786,711

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Segment Information and Segmented Total Assets

Eversource's segment information is as follows:

























	For the Three Months Ended March 31, 2026
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,940.5	$	1,373.2	$	584.6	$	53.6	$	484.4	$	(931.9)	$	4,504.4
Depreciation and Amortization	(541.7)		(97.5)		(115.2)		(12.4)		(60.6)		4.1		(823.3)
Operations and Maintenance (1)
Operations, Excluding Storm Costs	(106.9)		(50.7)		(34.7)
Corporate Shared Services	(121.6)		(30.4)		(21.7)
Storm Costs	(28.9)		—		—
Employee Benefits	(39.1)		(20.9)		(11.7)
Uncollectible Expense	(35.6)		(33.5)		—
Other	(31.3)		(0.3)		(16.3)
Total Operations and Maintenance	(363.4)		(135.8)		(84.4)		(22.7)		(391.8)		491.1		(507.0)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2)	(1,735.0)		(717.9)		(74.1)		(6.9)		(0.8)		436.7		(2,098.0)
Operating Income	300.4		422.0		310.9		11.6		31.2		—		1,076.1
Interest Expense	(100.0)		(34.0)		(83.1)		(7.2)		(180.2)		39.2		(365.3)

Interest Income	20.5		7.8		0.1		—		39.2		(39.2)		28.4
Other Income, Net	45.0		6.7		14.2		1.7		692.2		(687.0)		72.8
Income Tax (Expense)/Benefit	(61.9)		(107.2)		(61.0)		0.3		26.5		—		(203.3)
Net Income	204.0		295.3		181.1		6.4		608.9		(687.0)		608.7
Net Income Attributable to Noncontrolling Interests	(1.2)		—		(0.7)		—		—		—		(1.9)
Net Income Attributable to Common Shareholders	$	202.8	$	295.3	$	180.4	$	6.4	$	608.9	$	(687.0)	$	606.8
Cash Flows Used for Investments in Plant	$	458.9	$	152.1	$	281.7	$	30.8	$	85.8	$	—	$	1,009.3

























	For the Three Months Ended March 31, 2025
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,777.7	$	1,141.4	$	547.8	$	50.3	$	439.0	$	(837.8)	$	4,118.4
Depreciation and Amortization	(564.7)		(104.5)		(106.8)		(11.2)		(50.6)		2.8		(835.0)
Operations and Maintenance (1)
Operations, Excluding Storm Costs	(101.7)		(46.2)		(31.5)
Corporate Shared Services	(116.4)		(30.3)		(21.8)
Storm Costs	(19.9)		—		—
Employee Benefits	(48.6)		(18.6)		(11.7)
Uncollectible Expense	(43.7)		(30.0)		—
Other	(27.4)		2.1		(10.9)
Total Operations and Maintenance	(357.7)		(123.0)		(75.9)		(22.8)		(349.1)		441.0		(487.5)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2)	(1,580.6)		(605.2)		(69.6)		(6.8)		(1.4)		394.1		(1,869.5)
Operating Income	274.7		308.7		295.5		9.5		37.9		0.1		926.4
Interest Expense	(91.1)		(28.4)		(38.6)		(7.7)		(178.4)		43.4		(300.8)

Interest Income	27.3		6.7		—		—		43.4		(43.4)		34.0
Other Income, Net	35.3		5.5		12.1		0.8		625.7		(621.1)		58.3
Income Tax (Expense)/Benefit	(56.6)		(74.1)		(68.9)		1.0		33.4		—		(165.2)
Net Income	189.6		218.4		200.1		3.6		562.0		(621.0)		552.7
Net Income Attributable to Noncontrolling Interests	(1.2)		—		(0.7)		—		—		—		(1.9)
Net Income Attributable to Common Shareholders	$	188.4	$	218.4	$	199.4	$	3.6	$	562.0	$	(621.0)	$	550.8
Cash Flows Used for Investments in Plant	$	489.6	$	193.9	$	244.8	$	28.5	$	50.6	$	—	$	1,007.4

The following table summarizes Eversource's segmented total assets:


Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
As of March 31, 2026	$	35,382.0	$	10,919.0	$	17,227.4	$	2,990.3	$	30,549.2	$	(32,360.3)	$	64,707.6
As of December 31, 2025	34,858.1		10,865.5		17,193.9		2,977.6		29,743.3		(31,851.7)		63,786.7

DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - NSTAR Electric - Level 3 - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Current Derivative Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Current Derivative Assets	$ 131.2	$ 91.0
Long-Term Derivative Liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-Term Derivative Liabilities	$ (636.2)	$ (753.1)

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References + Details

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Operating Revenues	$ 4,504,363	$ 4,118,355
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	1,518,174	1,340,337
Operations and Maintenance	506,980	487,451
Depreciation	420,481	379,579
Amortization	402,764	455,449
Energy Efficiency Programs	291,499	257,550
Taxes Other Than Income Taxes	288,317	271,595
Total Operating Expenses	3,428,215	3,191,961
Operating Income	1,076,148	926,394
Interest Expense	365,259	300,849
Other Income, Net	101,159	92,344
Income Before Income Tax Expense	812,048	717,889
Income Tax Expense	203,327	165,221
Net Income	608,721	552,668
Net Income Attributable to Noncontrolling Interests	1,880	1,880
Net Income Attributable to Common Shareholders	$ 606,841	$ 550,788
Basic Earnings Per Common Share (in dollars per share)	$ 1.61	$ 1.50
Diluted Earnings Per Common Share (in dollars per share)	$ 1.61	$ 1.50
Weighted Average Common Shares Outstanding:
Basic (in shares)	376,026,090	367,320,246
Diluted (in shares)	376,583,614	367,677,618

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash	$ 270,184	$ 135,351
Receivables, Net (net of allowance for uncollectible accounts)	2,080,805	1,847,094
Unbilled Revenues	217,605	275,108
Materials, Supplies and REC Inventory	489,415	491,592
Regulatory Assets	1,897,191	1,975,083
Prepayments and Other Current Assets	389,535	352,958
Total Current Assets	5,344,735	5,077,186
Property, Plant and Equipment, Net	46,470,244	45,930,959
Deferred Debits and Other Assets:
Regulatory Assets	5,768,159	5,718,646
Prepaid Pension and PBOP	1,566,418	1,511,169
Other Long-Term Assets	1,002,089	997,883
Total Deferred Debits and Other Assets	12,892,622	12,778,566
Total Assets	64,707,601	63,786,711
Current Liabilities:
Notes Payable	533,000	1,525,445
Long-Term Debt – Current Portion	2,643,097	1,392,948
Accounts Payable	1,662,046	1,859,692
Regulatory Liabilities	1,739,987	1,264,609
Other Current Liabilities	1,290,226	1,274,450
Total Current Liabilities	8,209,723	7,808,512
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,894,583	5,647,218
Regulatory Liabilities	4,323,619	4,273,465
Derivative Liabilities	100,531	100,859
Other Long-Term Liabilities	1,138,347	1,101,932
Total Deferred Credits and Other Liabilities	12,690,972	12,472,065
Long-Term Debt	26,861,131	26,872,433
Preferred Stock Not Subject to Mandatory Redemption	155,568	155,568
Common Shareholders' Equity:
Capital Surplus, Paid In	9,950,113	9,937,878
Retained Earnings	4,815,846	4,504,983
Accumulated Other Comprehensive Income (Loss)	(20,377)	(20,507)
Common Shareholders' Equity	16,530,950	16,197,271
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	64,707,601	63,786,711
NSTAR Electric Company
Current Assets:
Cash	190,821	8,302
Unbilled Revenues	45,989	56,948
Materials, Supplies and REC Inventory	234,150	210,865
Regulatory Assets	1,018,886	978,754
Derivative Assets	131,156	91,011
Prepayments and Other Current Assets	15,606	90,040
Total Current Assets	2,412,656	2,332,299
Property, Plant and Equipment, Net	15,569,419	15,308,896
Deferred Debits and Other Assets:
Regulatory Assets	1,805,604	1,823,522
Prepaid Pension and PBOP	826,909	804,109
Other Long-Term Assets	275,491	264,073
Total Deferred Debits and Other Assets	2,908,004	2,891,704
Total Assets	20,890,079	20,532,899
Current Liabilities:
Notes Payable	0	245,445
Long-Term Debt – Current Portion	300,000	300,000
Obligations to Third Party Suppliers	183,320	179,757
Renewable Portfolio Standards Compliance Obligations	117,185	98,648
Regulatory Liabilities	835,408	650,813
Other Current Liabilities	148,805	110,331
Total Current Liabilities	2,338,352	2,341,306
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	2,110,852	2,087,287
Regulatory Liabilities	1,722,355	1,702,059
Derivative Liabilities	636,179	753,149
Other Long-Term Liabilities	410,335	401,625
Total Deferred Credits and Other Liabilities	4,879,721	4,944,120
Long-Term Debt	5,646,738	5,645,638
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	4,496,842	4,238,842
Retained Earnings	3,485,228	3,319,768
Accumulated Other Comprehensive Income (Loss)	198	225
Common Shareholders' Equity	7,982,268	7,558,835
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	20,890,079	20,532,899
NSTAR Electric Company \| Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	575,045	616,280
Current Liabilities:
Accounts Payable	566,106	558,227
NSTAR Electric Company \| Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	201,003	280,099
Current Liabilities:
Accounts Payable	$ 187,528	$ 198,085

MARKETABLE SECURITIES - Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Amortized Cost
Less than one year	$ 11.8
One to five years	45.2
Six to ten years	22.7
Greater than ten years	71.9
Amortized Cost	151.6	$ 156.5
Fair Value
Less than one year	12.0
One to five years	46.0
Six to ten years	22.9
Greater than ten years	71.0
Fair Value	$ 151.9	$ 155.4

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Narrative (Details) - PSNH - Rate Reduction Bonds $ in Millions	May 31, 2018 USD ($)
Debt Instrument [Line Items]
Amount of securitized rate reduction bonds issued	$ 635.7
Weighted average interest rate (in percent)	3.66%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Income	The Connecticut Light and Power Company	The Connecticut Light and Power Company Common Stock	The Connecticut Light and Power Company Capital Surplus, Paid In	The Connecticut Light and Power Company Retained Earnings	The Connecticut Light and Power Company Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2024		366,608,052					6,035,205
Beginning balance at Dec. 31, 2024	$ 15,039,387	$ 1,878,622	$ 9,428,905	$ 3,929,141	$ (26,472)	$ 6,563,882	$ 60,352	$ 3,684,265	$ 2,819,107	$ 158
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						156,236			156,236
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(276,229)			(276,229)		(247,000)			(247,000)
Other Comprehensive Income (Loss)						(6)				(6)
Ending balance (in shares) at Mar. 31, 2025		367,307,083					6,035,205
Ending balance at Mar. 31, 2025	$ 15,341,257	$ 1,878,622	9,440,596	4,203,700	(23,949)	6,471,722	$ 60,352	3,684,265	2,726,953	152
Beginning balance (in shares) at Dec. 31, 2025	375,416,880	375,416,880					6,035,205
Beginning balance at Dec. 31, 2025	$ 16,197,271	$ 1,914,273	9,937,878	4,504,983	(20,507)	6,679,626	$ 60,352	3,684,265	2,934,877	132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						139,329			139,329
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	$ (295,978)			(295,978)		(88,400)			(88,400)
Other Comprehensive Income (Loss)						(7)				(7)
Ending balance (in shares) at Mar. 31, 2026	375,974,644	375,974,644					6,035,205
Ending balance at Mar. 31, 2026	$ 16,530,950	$ 1,914,273	$ 9,950,113	$ 4,815,846	$ (20,377)	$ 6,729,158	$ 60,352	$ 3,684,265	$ 2,984,416	$ 125

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

+ Details

COMMON SHARES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
COMMON SHARES - Narrative (Details) - USD ($) $ in Millions	May 30, 2025	Dec. 31, 2025	Mar. 31, 2026
Equity [Abstract]
Sale of stock, issuance of common stock, maximum	$ 1,200.0
Sale of stock, number of shares issued in transaction (in shares)		7,130,134
Sale of stock, consideration received on transaction		$ 465.4
Treasury stock, common (in shares)		7,437,621	6,879,857
Common stock outstanding (in shares)		375,416,880	375,974,644

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Allowance for uncollectible accounts	$ 611,700	$ 580,539
PSNH
Allowance for uncollectible accounts	$ 24,304	$ 23,547

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Summary of Accounting Policies [Line Items]
Other Income, Net	$ 101,159	$ 92,344
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other Income, Net	44,200	32,600
AFUDC Equity
Summary of Accounting Policies [Line Items]
Other Income, Net	23,900	23,900
Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other Income, Net	3,800	6,000
Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other Income, Net	300	(2,000)
Interest Income
Summary of Accounting Policies [Line Items]
Other Income, Net	28,400	34,000
Other
Summary of Accounting Policies [Line Items]
Other Income, Net	600	(2,200)
CL&P
Summary of Accounting Policies [Line Items]
Other Income, Net	17,616	17,599
CL&P \| Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other Income, Net	11,900	8,300
CL&P \| AFUDC Equity
Summary of Accounting Policies [Line Items]
Other Income, Net	4,600	3,600
CL&P \| Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other Income, Net	0	0
CL&P \| Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other Income, Net	(100)	100
CL&P \| Interest Income
Summary of Accounting Policies [Line Items]
Other Income, Net	1,200	5,600
CL&P \| Other
Summary of Accounting Policies [Line Items]
Other Income, Net	0	0
NSTAR Electric
Summary of Accounting Policies [Line Items]
Other Income, Net	51,684	46,292
NSTAR Electric \| Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other Income, Net	19,000	14,800
NSTAR Electric \| AFUDC Equity
Summary of Accounting Policies [Line Items]
Other Income, Net	15,700	14,100
NSTAR Electric \| Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other Income, Net	100	200
NSTAR Electric \| Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other Income, Net	400	(1,800)
NSTAR Electric \| Interest Income
Summary of Accounting Policies [Line Items]
Other Income, Net	16,400	19,000
NSTAR Electric \| Other
Summary of Accounting Policies [Line Items]
Other Income, Net	100	0
PSNH
Summary of Accounting Policies [Line Items]
Other Income, Net	10,502	10,758
PSNH \| Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other Income, Net	5,200	4,100
PSNH \| AFUDC Equity
Summary of Accounting Policies [Line Items]
Other Income, Net	2,300	3,900
PSNH \| Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other Income, Net	0	0
PSNH \| Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other Income, Net	0	100
PSNH \| Interest Income
Summary of Accounting Policies [Line Items]
Other Income, Net	3,000	2,700
PSNH \| Other
Summary of Accounting Policies [Line Items]
Other Income, Net	$ 0	$ 0

COMMON SHARES

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

COMMON SHARES


	Shares
			Authorized as of March 31, 2026 and December 31, 2025	Issued as of
	Par Value			March 31, 2026	December 31, 2025
Eversource	$	5	410,000,000	382,854,501	382,854,501
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

- Definition

The entire disclosure for equity.

+ References

+ Details

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION

3 Months Ended

Mar. 31, 2026

Postemployment Benefits [Abstract]

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION

Eversource provides defined benefit retirement plans (Pension Plans) that cover eligible employees. In addition to the Pension Plans, Eversource maintains non-qualified defined benefit retirement plans (SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible participants consisting of current and retired employees. Eversource also provides defined benefit postretirement plans (PBOP Plans) that provide life insurance and a health reimbursement arrangement created for the purpose of reimbursing retirees and dependents for health insurance premiums and certain medical expenses to eligible employees that meet certain age and service eligibility requirements.

The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets/(liabilities) for future recovery or refund, are shown below. The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of income. Pension, SERP and PBOP expense/(income) reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis.














	Pension and SERP								PBOP
	For the Three Months Ended March 31, 2026								For the Three Months Ended March 31, 2026
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	18.4	$	3.9	$	3.2	$	1.6	$	1.6	$	0.3	$	0.3	$	0.1
Interest Cost	59.1		12.1		12.2		6.2		7.2		1.3		1.9		0.8
Expected Return on Plan Assets	(117.3)		(23.9)		(28.9)		(12.4)		(22.7)		(2.6)		(11.6)		(1.5)
Actuarial Loss/(Gain)	8.7		1.1		2.8		0.4		(0.4)		—		—		—
Prior Service Cost/(Credit)	0.2		—		0.1		—		(5.4)		0.3		(4.2)		0.1

Total Net Periodic Benefit Plan Income	$	(30.9)	$	(6.8)	$	(10.6)	$	(4.2)	$	(19.7)	$	(0.7)	$	(13.6)	$	(0.5)
Intercompany Income Allocations	N/A		$	(1.8)	$	(1.5)	$	(0.5)	N/A		$	(0.6)	$	(0.8)	$	(0.3)













	Pension and SERP								PBOP
	For the Three Months Ended March 31, 2025								For the Three Months Ended March 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	16.4	$	3.8	$	2.5	$	1.6	$	1.6	$	0.2	$	0.2	$	0.1
Interest Cost	63.2		12.8		13.0		6.8		8.0		1.4		2.2		0.8
Expected Return on Plan Assets	(113.3)		(22.9)		(27.7)		(11.9)		(21.2)		(2.4)		(10.5)		(1.4)
Actuarial Loss/(Gain)	10.0		1.2		3.2		0.5		(0.3)		—		—		—
Prior Service Cost/(Credit)	0.3		—		0.1		—		(5.4)		0.3		(4.2)		0.1
Settlement Loss	3.3		—		—		—		—		—		—		—
Total Net Periodic Benefit Plan Income	$	(20.1)	$	(5.1)	$	(8.9)	$	(3.0)	$	(17.3)	$	(0.5)	$	(12.3)	$	(0.4)
Intercompany Expense/(Income) Allocations	N/A		$	0.1	$	0.3	$	0.1	N/A		$	(0.5)	$	(0.7)	$	(0.2)

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (p)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480266/715-60-50-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480126/715-20-S99-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/715/tableOfContent

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

MARKETABLE SECURITIES - Marketable Securities Recorded at Fair Value on a Recurring Basis by Level (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 325.2	$ 320.7
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	181.5	179.3
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	143.7	141.4
Mutual Funds and Equities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	173.3	165.3
Money Market Funds \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	8.2	14.0
U.S. Government Issued Debt Securities (Agency and Treasury) \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	82.9	82.0
Corporate Debt Securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	38.6	37.9
Asset-Backed Debt Securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6.1	6.4
Municipal Bonds \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	7.3	7.2
Other Fixed Income Securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 8.8	$ 7.9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 580,500	$ 556,200
Uncollectible Expense	30,795	22,863
Uncollectible Costs Deferred	46,600	33,200
Write-Offs	(50,700)	(50,400)
Recoveries Collected	4,500	3,700
Ending balance	611,700	565,600
CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	258,500	279,100
Uncollectible Expense	5,491	4,671
Uncollectible Costs Deferred	24,900	10,700
Write-Offs	(16,400)	(19,400)
Recoveries Collected	1,500	1,100
Ending balance	274,000	276,200
NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	132,600	114,900
Uncollectible Expense	8,299	7,485
Uncollectible Costs Deferred	3,900	9,000
Write-Offs	(19,200)	(16,800)
Recoveries Collected	1,500	1,400
Ending balance	127,100	116,000
PSNH
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	23,500	14,100
Uncollectible Expense	1,442	1,315
Uncollectible Costs Deferred	2,200	1,400
Write-Offs	(3,100)	(2,700)
Recoveries Collected	300	200
Ending balance	24,300	14,300
Hardship Accounts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	367,200	364,600
Uncollectible Expense	0	0
Uncollectible Costs Deferred	27,800	19,400
Write-Offs	(12,200)	(12,600)
Recoveries Collected	400	100
Ending balance	383,200	371,500
Hardship Accounts \| CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	225,700	240,700
Uncollectible Expense	0	0
Uncollectible Costs Deferred	22,100	8,800
Write-Offs	(9,500)	(9,300)
Recoveries Collected	300	100
Ending balance	238,600	240,300
Hardship Accounts \| NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	60,700	55,200
Uncollectible Expense	0	0
Uncollectible Costs Deferred	(3,500)	3,500
Write-Offs	(600)	(900)
Recoveries Collected	0	0
Ending balance	56,600	57,800
Retail (Non-Hardship), Wholesale, and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	213,300	191,600
Uncollectible Expense	30,800	22,900
Uncollectible Costs Deferred	18,800	13,800
Write-Offs	(38,500)	(37,800)
Recoveries Collected	4,100	3,600
Ending balance	228,500	194,100
Retail (Non-Hardship), Wholesale, and Other \| CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	32,800	38,400
Uncollectible Expense	5,500	4,700
Uncollectible Costs Deferred	2,800	1,900
Write-Offs	(6,900)	(10,100)
Recoveries Collected	1,200	1,000
Ending balance	35,400	35,900
Retail (Non-Hardship), Wholesale, and Other \| NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	71,900	59,700
Uncollectible Expense	8,300	7,500
Uncollectible Costs Deferred	7,400	5,500
Write-Offs	(18,600)	(15,900)
Recoveries Collected	1,500	1,400
Ending balance	$ 70,500	$ 58,200

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Impact of Funding on the Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	$ 7,665,400	$ 7,693,700
Other Regulatory Liabilities (included in Regulatory Liabilities)	4,323,619	4,273,465
Accrued Interest (included in Other Current Liabilities)	1,290,226	1,274,450
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	259,257	280,862
Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	295,300	306,100
Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	181,100	189,900
Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	56,200	93,600
Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	3,200	3,200
PSNH
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	971,900	961,100
Other Regulatory Liabilities (included in Regulatory Liabilities)	425,128	417,442
Accrued Interest (included in Other Current Liabilities)	71,076	62,334
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	259,257	280,862
PSNH \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Rate Reduction Bonds - Current Portion	43,200	43,200
Rate Reduction Bonds - Long-Term Portion	259,300	280,900
PSNH \| Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	295,300	306,100
PSNH \| Securitized Stranded Costs \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	295,300	306,100
PSNH \| Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	2,700	3,000
PSNH \| Other Regulatory Assets \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Other Regulatory Liabilities (included in Regulatory Liabilities)	9,100	7,300
Accrued Interest (included in Other Current Liabilities)	1,900	5,100
PSNH \| Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	22,200	38,300
PSNH \| Current Derivative Assets \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,400	30,600
PSNH \| Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	3,200	3,200
PSNH \| Other Long-Term Assets \| VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	$ 3,200	$ 3,200

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Revenues	$ 4,504,363	$ 4,118,355
Operating Expenses:
Purchased Power and Transmission	1,518,174	1,340,337
Operations and Maintenance	506,980	487,451
Depreciation	420,481	379,579
Energy Efficiency Programs	291,499	257,550
Taxes Other Than Income Taxes	288,317	271,595
Total Operating Expenses	3,428,215	3,191,961
Operating Income	1,076,148	926,394
Interest Expense	365,259	300,849
Other Income, Net	101,159	92,344
Income Before Income Tax Expense	812,048	717,889
Income Tax Expense	203,327	165,221
The Connecticut Light and Power Company
Operating Revenues	1,568,126	1,541,189
Operating Expenses:
Purchased Power and Transmission	588,147	494,204
Operations and Maintenance	190,344	189,156
Depreciation	111,745	106,680
Amortization of Regulatory Assets, Net	280,022	343,213
Energy Efficiency Programs	36,238	51,611
Taxes Other Than Income Taxes	120,564	115,261
Total Operating Expenses	1,327,060	1,300,125
Operating Income	241,066	241,064
Interest Expense	74,187	49,910
Other Income, Net	17,616	17,599
Income Before Income Tax Expense	184,495	208,753
Income Tax Expense	45,166	52,517
Net Income	$ 139,329	$ 156,236

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Stockholders' Equity [Abstract]
Dividends on Common Shares (in dollars per share)	$ 0.7875	$ 0.7525

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Attributable to Parent [Roll Forward]
Beginning balance	$ 16,197,271	$ 15,039,387
Other Comprehensive Income, Net of Tax	130	2,523
Ending balance	16,530,950	15,341,257
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(20,507)	(26,472)
Amounts Reclassified from AOCI	100	2,500
Other Comprehensive Income, Net of Tax	130	2,523
Ending balance	(20,377)	(23,949)
Ending balance		(24,000)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(400)	(400)
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income, Net of Tax	0	0
Ending balance	(400)	(400)
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(20,100)	(26,100)
Amounts Reclassified from AOCI	100	2,500
Other Comprehensive Income, Net of Tax	100	2,500
Ending balance	$ (20,000)	$ (23,600)

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

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+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

+ Details

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2024		366,608,052
Beginning balance at Dec. 31, 2024	$ 15,039,387	$ 1,878,622	$ 9,428,905	$ 3,929,141	$ (26,472)	$ (170,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	552,668			552,668
Dividends on Common Stock	(276,229)			(276,229)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(28,230)		(28,230)
Issuance of Treasury Shares (in shares)		699,031
Issuance of Treasury Shares	53,018		39,921			13,097
Other Comprehensive Income	2,523				2,523
Ending balance (in shares) at Mar. 31, 2025		367,307,083
Ending balance at Mar. 31, 2025	$ 15,341,257	$ 1,878,622	9,440,596	4,203,700	(23,949)	(157,712)
Beginning balance (in shares) at Dec. 31, 2025	375,416,880	375,416,880
Beginning balance at Dec. 31, 2025	$ 16,197,271	$ 1,914,273	9,937,878	4,504,983	(20,507)	(139,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	608,721			608,721
Dividends on Common Stock	(295,978)			(295,978)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(24,577)		(24,577)
Issuance of Treasury Shares (in shares)		557,764
Issuance of Treasury Shares	47,263		36,812			10,451
Other Comprehensive Income	$ 130				130
Ending balance (in shares) at Mar. 31, 2026	375,974,644	375,974,644
Ending balance at Mar. 31, 2026	$ 16,530,950	$ 1,914,273	$ 9,950,113	$ 4,815,846	$ (20,377)	$ (128,905)

MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	$ 2.9	$ 3.5
Unrealized gain (losses)	(0.6)	$ (0.3)
CYAPC and YAEC
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	$ 170.4		$ 161.8

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Allowance for uncollectible accounts	$ 611,700	$ 580,539

REGULATORY ACCOUNTING

3 Months Ended

Mar. 31, 2026

Regulated Operations [Abstract]

REGULATORY ACCOUNTING

Eversource's utility companies are subject to rate regulation that is based on cost recovery and meets the criteria for application of accounting guidance for rate-regulated operations, which considers the effect of regulation on the timing of the recognition of certain revenues and expenses. The regulated companies' financial statements reflect the effects of the rate-making process. The rates charged to the customers of Eversource's regulated companies are designed to collect each company's costs to provide service, including a return on investment.

The application of accounting guidance for rate-regulated enterprises results in recording regulatory assets and liabilities. Regulatory assets represent the deferral of incurred costs that are probable of future recovery in customer rates. Regulatory assets are amortized as the incurred costs are recovered through customer rates. Regulatory liabilities represent either revenues received from customers to fund expected costs that have not yet been incurred or probable future refunds to customers.

Management believes it is probable that each of the regulated companies will recover its respective investments in long-lived assets and the regulatory assets that have been recorded. If management were to determine that it could no longer apply the accounting guidance applicable to rate-regulated enterprises, or if management could not conclude it is probable that costs would be recovered from customers in future rates, the applicable costs would be charged to net income in the period in which the determination is made.

Regulatory Assets: The components of regulatory assets were as follows:


	As of March 31, 2026								As of December 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Storm Costs, Net	$	2,100.4	$	1,028.9	$	602.7	$	468.8	$	1,959.3	$	991.3	$	499.6	$	468.4
Regulatory Tracking Mechanisms	1,540.3		172.7		749.7		115.9		1,573.8		206.5		705.6		93.2
Income Taxes, Net	1,051.0		547.0		165.9		22.4		1,044.5		546.1		161.5		23.3
Benefit Costs	984.9		172.5		297.1		61.3		992.8		173.7		300.0		61.7
Derivative Contracts	636.2		—		636.2		—		753.2		0.1		753.1		—
Securitized Stranded Costs	295.3		—		—		295.3		306.1		—		—		306.1
Cost of Removal	267.5		—		8.1		—		262.5		—		8.1		—
Goodwill-related	226.2		—		194.2		—		230.4		—		197.8		—
Asset Retirement Obligations	166.0		44.9		86.1		5.5		162.8		44.2		84.6		5.4
Environmental Remediation Costs	134.2		—		—		—		136.1		—		—		—
EGMA Acquisition and Integration Costs	82.3		—		—		—		82.3		—		—		—
Other Regulatory Assets	181.1		19.4		84.5		2.7		189.9		19.5		92.0		3.0
Total Regulatory Assets	7,665.4		1,985.4		2,824.5		971.9		7,693.7		1,981.4		2,802.3		961.1
Less: Current Portion	1,897.2		235.0		1,018.9		101.4		1,975.1		265.2		978.8		119.9
Total Long-Term Regulatory Assets	$	5,768.2	$	1,750.4	$	1,805.6	$	870.5	$	5,718.6	$	1,716.2	$	1,823.5	$	841.2

Regulatory Costs in Other Long-Term Assets: Eversource's regulated companies had $247.4 million (including $130.3 million for CL&P, $47.4 million for NSTAR Electric and $5.1 million for PSNH) and $244.2 million (including $127.1 million for CL&P, $51.0 million for NSTAR Electric and $5.4 million for PSNH) of additional regulatory costs not yet specifically approved as of March 31, 2026 and December 31, 2025, respectively, that were included in Other Long-Term Assets on the balance sheets. These amounts will be reclassified to Regulatory Assets upon approval by the applicable regulatory agency. Based on regulatory policies or past precedent on similar costs, management believes it is probable that these costs will ultimately be approved and recovered from customers in rates. As of March 31, 2026 and December 31, 2025, these regulatory costs included $123.7 million (including $60.9 million for CL&P and $30.7 million for NSTAR Electric) and $123.2 million (including $57.0 million for CL&P and $34.0 million for NSTAR Electric), respectively, of deferred uncollectible hardship costs.

Regulatory Liabilities: The components of regulatory liabilities were as follows:


	As of March 31, 2026								As of December 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017	$	2,407.8	$	928.6	$	841.2	$	317.3	$	2,423.4	$	933.3	$	847.9	$	319.8
Regulatory Tracking Mechanisms	1,578.2		661.8		648.2		125.5		1,186.6		457.3		535.2		111.2
Cost of Removal	917.7		297.5		498.0		54.6		867.1		275.1		479.4		45.5
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP	534.5		76.2		264.7		50.9		509.4		72.8		252.5		48.5
AFUDC - Transmission	187.3		74.7		112.6		—		179.4		72.0		107.4		—
Derivative Contract	131.2		—		131.2		—		91.0		—		91.0		—
Benefit Costs	74.9		9.1		20.2		6.9		80.4		8.8		24.5		6.8
Other Regulatory Liabilities	232.0		56.4		41.7		4.0		200.8		43.3		15.0		4.0
Total Regulatory Liabilities	6,063.6		2,104.3		2,557.8		559.2		5,538.1		1,862.6		2,352.9		535.8
Less: Current Portion	1,740.0		635.3		835.4		134.1		1,264.6		417.5		650.8		118.4
Total Long-Term Regulatory Liabilities	$	4,323.6	$	1,469.0	$	1,722.4	$	425.1	$	4,273.5	$	1,445.1	$	1,702.1	$	417.4

FERC ROE Complaints: As of March 31, 2026, Eversource has a regulatory liability for revenues subject to refund of $60.4 million (pre-tax) as a result of the March 19, 2026 FERC decision in the FERC ROE complaint proceedings, which is reflected within Regulatory Tracking Mechanisms in the table above. The regulatory liability totaled $28.7 million for CL&P, $24.2 million for NSTAR Electric, and $7.5 million for PSNH. The liability recorded reflects the difference between the billed ROE and the replacement ROE for the first complaint period, including interest. Eversource does not have any other reserves recorded for the other complaint periods, as these remaining complaints were dismissed in the decision. See Note 9C, "Commitments and Contingencies – FERC ROE Complaints," for further information on the FERC ROE decision.

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	$ 420,481	$ 379,579
Deferred Income Taxes	81,402	(56,524)
Uncollectible Expense	30,795	22,863
Pension, SERP and PBOP Income, Net	(28,287)	(18,811)
Regulatory Over Recoveries, Net	126,339	84,461
Cost of Removal Expenditures	(41,385)	(67,151)
Other	28,255	15,840
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(264,738)	(288,984)
Taxes Receivable/Accrued, Net	247,015	288,790
Accounts Payable	(145,387)	(131,367)
Other Current Assets and Liabilities, Net	(141,649)	(196,218)
Net Cash Flows Provided by Operating Activities	1,324,326	1,040,595
Investing Activities:
Investments in Property, Plant and Equipment	(1,009,311)	(1,007,384)
Net Cash Flows Used in Investing Activities	(1,149,943)	(999,230)
Financing Activities:
Cash Dividends on Common Shares	(290,023)	(270,232)
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Decrease in Notes Payable	(992,445)	(552,694)
Other Financing Activities	(29,342)	(23,000)
Net Cash Flows (Used In)/Provided by Financing Activities	(82,837)	31,945
Net (Decrease)/Increase in Cash and Restricted Cash	91,546	73,310
Cash and Restricted Cash - Beginning of Period	246,245	127,308
Cash and Restricted Cash - End of Period	337,791	200,618
PSNH
Operating Activities:
Net Income	79,777	66,279
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	44,439	40,502
Deferred Income Taxes	9,324	11,127
Uncollectible Expense	1,442	1,315
Pension, SERP and PBOP Income, Net	(2,679)	(2,211)
Regulatory Over Recoveries, Net	(24,930)	(35,625)
Amortization of Regulatory Assets, Net	26,650	20,835
Cost of Removal Expenditures	(5,159)	(5,894)
Other	2,394	(4,195)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(23,426)	(6,051)
Taxes Receivable/Accrued, Net	8,975	(3,018)
Accounts Payable	(10,390)	7,498
Other Current Assets and Liabilities, Net	7,934	8,856
Net Cash Flows Provided by Operating Activities	114,351	99,418
Investing Activities:
Investments in Property, Plant and Equipment	(110,465)	(143,315)
Net Cash Flows Used in Investing Activities	(110,465)	(143,315)
Financing Activities:
Cash Dividends on Common Shares	(38,900)	0
Capital Contributions from Eversource Parent	0	75,000
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Decrease in Notes Payable	30,100	(16,600)
Other Financing Activities	(118)	0
Net Cash Flows (Used In)/Provided by Financing Activities	(30,523)	36,795
Net (Decrease)/Increase in Cash and Restricted Cash	(26,637)	(7,102)
Cash and Restricted Cash - Beginning of Period	55,186	37,243
Cash and Restricted Cash - End of Period	$ 28,549	$ 30,141

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Other Comprehensive Income, Net of Tax:
Comprehensive Income Attributable to Common Shareholders	$ 606,971	$ 553,311
NSTAR Electric Company
Net Income	165,950	167,175
Other Comprehensive Income, Net of Tax:
Changes in Funded Status of SERP Benefit Plan	(32)	(7)
Qualified Cash Flow Hedging Instruments	5	5
Other Comprehensive Loss, Net of Tax	(27)	(2)
Comprehensive Income Attributable to Common Shareholders	$ 165,923	$ 167,173

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A. Basis of Presentation

Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business. Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and EGMA (natural gas utilities), and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.6 million electric, natural gas and water customers through twelve regulated utilities in Connecticut, Massachusetts and New Hampshire.

The unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH include the accounts of each of their respective subsidiaries. Intercompany transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH and the unaudited condensed financial statements of CL&P are herein collectively referred to as the "financial statements."

The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations. The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2025 Form 10-K, which was filed with the SEC on February 17, 2026. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of March 31, 2026 and December 31, 2025, and the results of operations, comprehensive income, common shareholders' equity and cash flows for the three months ended March 31, 2026 and 2025. The results of operations, comprehensive income and cash flows for the three months ended March 31, 2026 and 2025 are not necessarily indicative of the results expected for a full year.

CYAPC and YAEC are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates the operations of CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent. Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements.

Eversource's utility subsidiaries' electric, natural gas and water distribution and transmission businesses are subject to rate-regulation that is based on cost recovery and meets the criteria for application of accounting guidance for entities with rate-regulated operations, which considers the effect of regulation on the differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries. See Note 2, "Regulatory Accounting," for further information.

On March 25, 2026, upon remand from the Connecticut Superior Court, PURA approved the sale of Aquarion to AWA. The Company evaluated whether Aquarion met the criteria to be classified as held for sale as of March 31, 2026, including whether the sale is considered probable to close within 12 months. Although PURA approved the transaction, legal opposition, including the potential for appeals, introduces significant uncertainty regarding the ultimate timing and consummation of the sale. As a result, the Company cannot assert that the sale of Aquarion is probable and concluded that the held‑for‑sale criteria were not met as of March 31, 2026. Closing of the transaction remains subject to finalization of working capital and other transaction-related adjustments and final closing costs, which could result in a loss recognized either upon meeting held for sale classification and measurement or at the time of sale.

Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.

B. Accounting Standards

Accounting Standards Issued but Not Yet Adopted: In September 2025, the Financial Accounting Standards Board issued ASU 2025-06, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) - Targeted Improvements to the Accounting for Internal-Use Software, to modernize and clarify the accounting for software costs. The ASU’s provisions change the criteria for capitalization of software development costs by eliminating consideration of “project development stages” and instead requiring consideration of the probability of software project completion for its intended use. The new accounting guidance is effective for interim and annual periods beginning after December 15, 2027, with early adoption permitted. Entities are permitted to apply one of three transition approaches: prospective, modified transition that is

based on the status of the project and whether software costs were capitalized before the date of adoption, or retrospective. Eversource is currently reviewing the requirements of ASU 2025-06.

C. Allowance for Uncollectible Accounts

Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs, and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third-party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables.

Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts). The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded.

The allowance for uncollectible accounts is determined based upon various judgments and factors, including an aging-based quantitative assessment that applies an estimated uncollectible percentage to each receivable aging category. Factors in determining credit loss include historical collection, write-off experience, analysis of delinquency statistics, and management's assessment of collectability from customers, including current economic conditions, customer payment trends, the impact on customer bills because of energy usage trends and changes in rates, flexible payment plans and financial hardship arrearage management programs offered to customers, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic conditions, collection efforts and other factors. Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible. Management concluded that the reserve balance as of March 31, 2026 adequately reflected the collection risk and net realizable value for its receivables.

The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively. The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance.

The total allowance for uncollectible accounts is included in Receivables, Net on the balance sheets. The activity in the allowance for uncollectible accounts by portfolio segment as of March 31st is as follows:


	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other		Total Allowance		Total Allowance








Balance as of January 1, 2026	$	367.2	$	213.3	$	580.5	$	225.7	$	32.8	$	258.5	$	60.7	$	71.9	$	132.6	$	23.5
Uncollectible Expense	—		30.8		30.8		—		5.5		5.5		—		8.3		8.3		1.4
Uncollectible Costs Deferred (1)	27.8		18.8		46.6		22.1		2.8		24.9		(3.5)		7.4		3.9		2.2
Write-Offs	(12.2)		(38.5)		(50.7)		(9.5)		(6.9)		(16.4)		(0.6)		(18.6)		(19.2)		(3.1)
Recoveries Collected	0.4		4.1		4.5		0.3		1.2		1.5		—		1.5		1.5		0.3

Balance as of March 31, 2026	$	383.2	$	228.5	$	611.7	$	238.6	$	35.4	$	274.0	$	56.6	$	70.5	$	127.1	$	24.3











Balance as of January 1, 2025	$	364.6	$	191.6	$	556.2	$	240.7	$	38.4	$	279.1	$	55.2	$	59.7	$	114.9	$	14.1
Uncollectible Expense	—		22.9		22.9		—		4.7		4.7		—		7.5		7.5		1.3
Uncollectible Costs Deferred (1)	19.4		13.8		33.2		8.8		1.9		10.7		3.5		5.5		9.0		1.4
Write-Offs	(12.6)		(37.8)		(50.4)		(9.3)		(10.1)		(19.4)		(0.9)		(15.9)		(16.8)		(2.7)
Recoveries Collected	0.1		3.6		3.7		0.1		1.0		1.1		—		1.4		1.4		0.2
Balance as of March 31, 2025	$	371.5	$	194.1	$	565.6	$	240.3	$	35.9	$	276.2	$	57.8	$	58.2	$	116.0	$	14.3

D. Fair Value Measurements

Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to marketable securities held in trusts. Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, AROs, and in the valuation of business combinations and asset acquisitions. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs.

Fair Value Hierarchy: In measuring fair value, Eversource uses observable market data when available in order to minimize the use of unobservable inputs. Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes. The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement. Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis.

The levels of the fair value hierarchy are described below:

Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable.

Level 3 - Quoted market prices are not available. Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable. Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products.

Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy.

Determination of Fair Value: The valuation techniques and inputs used in Eversource's fair value measurements are described in Note 4, "Derivative Instruments," Note 5, "Marketable Securities," and Note 10, "Fair Value of Financial Instruments," to the financial statements.

E. Other Income, Net

The components of Other Income, Net on the statements of income were as follows:














	For the Three Months Ended
	March 31, 2026								March 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion	$	44.2	$	11.9	$	19.0	$	5.2	$	32.6	$	8.3	$	14.8	$	4.1
AFUDC Equity	23.9		4.6		15.7		2.3		23.9		3.6		14.1		3.9
Equity in Earnings of Unconsolidated Affiliates	3.8		—		0.1		—		6.0		—		0.2		—
Investment Income/(Loss)	0.3		(0.1)		0.4		—		(2.0)		0.1		(1.8)		0.1
Interest Income	28.4		1.2		16.4		3.0		34.0		5.6		19.0		2.7

Other	0.6		—		0.1		—		(2.2)		—		—		—
Total Other Income, Net	$	101.2	$	17.6	$	51.7	$	10.5	$	92.3	$	17.6	$	46.3	$	10.8

F. Other Taxes

Eversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:


	For the Three Months Ended
(Millions of Dollars)		March 31, 2026		March 31, 2025
Eversource		$	68.1	$	63.7
CL&P		52.9		52.9

As agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income.

G. Supplemental Cash Flow Information

Non-cash investing activities include plant additions included in Accounts Payable as follows:


(Millions of Dollars)	As of March 31, 2026		As of March 31, 2025
Eversource	$	346.5	$	427.2
CL&P	113.8		82.3
NSTAR Electric	117.1		172.8
PSNH	39.1		58.2

The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:


	As of March 31, 2026								As of December 31, 2025
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Cash as reported on the Balance Sheets	$	270.2	$	13.0	$	190.8	$	3.1	$	135.4	$	87.6	$	8.3	$	13.7
Restricted cash included in:
Special Deposits	56.2		1.1		—		22.2		93.6		1.1		17.6		38.3

Marketable Securities	8.2		—		—		—		14.0		—		—		—
Other Long-Term Assets	3.2		—		—		3.2		3.2		—		—		3.2
Cash and Restricted Cash as reported on the Statements of Cash Flows	$	337.8	$	14.1	$	190.8	$	28.5	$	246.2	$	88.7	$	25.9	$	55.2

Special Deposits represent cash collections related to the PSNH RRB customer charges that are held in trust, required ISO-NE cash deposits, cash held in escrow accounts, and CYAPC and YAEC cash balances. Special Deposits are included in Current Assets on the balance sheets. Restricted cash included in Marketable Securities represents money market funds held in restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations.

Eversource’s restricted cash also includes an Energy Relief Fund for energy efficiency and clean energy measures in the Merrimack Valley established under the terms of an EGMA 2020 settlement agreement. This restricted cash held in escrow accounts included $17.4 million and $21.4 million recorded as short-term in Special Deposits as of March 31, 2026 and December 31, 2025

EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended
EARNINGS PER SHARE - Narrative (Details) - shares	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Antidilutive share awards excluded from the EPS computation (in shares)	0	0

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income	$ 608,721	$ 552,668
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	5	5
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	125	2,518
Other Comprehensive Income, Net of Tax	130	2,523
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)
Comprehensive Income Attributable to Common Shareholders	$ 606,971	$ 553,311

- Definition

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- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

SHORT-TERM AND LONG-TERM DEBT - Borrowings Outstanding and Available under the Commercial Paper Programs (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Borrowings Outstanding as of	$ 533,000	$ 1,525,445
Commercial Paper \| Eversource Parent Commercial Paper Program
Debt Instrument [Line Items]
Borrowings Outstanding as of	533,000	1,280,000
Available Borrowing Capacity as of	$ 1,467,000	$ 720,000
Weighted-average interest rate (in percent)	4.08%	3.98%
Commercial Paper \| NSTAR Electric
Debt Instrument [Line Items]
Borrowings Outstanding as of	$ 0	$ 245,400
Available Borrowing Capacity as of	$ 650,000	$ 404,600
Weighted-average interest rate (in percent)	0.00%	3.87%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

COMMITMENTS AND CONTINGENCIES - Environmental Matters Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Site Contingency [Line Items]
Reserve balance	$ 154.1	$ 154.3
MGP Sites
Site Contingency [Line Items]
Reserve balance	$ 139.9	$ 140.9

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES

3 Months Ended

Mar. 31, 2026

Rate Reduction Bonds and Variable Interest Entity [Abstract]

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES

Rate Reduction Bonds: In May 2018, PSNH Funding, a wholly-owned subsidiary of PSNH, issued $635.7 million of securitized RRBs in multiple tranches with a weighted average interest rate of 3.66 percent, and final maturity dates ranging from 2026 to 2035. The RRBs are expected to be repaid by February 1, 2033. RRB payments consist of principal and interest and are paid semi-annually, beginning on February 1, 2019. The RRBs were issued pursuant to a finance order issued by the NHPUC in January 2018 to recover remaining costs resulting from the divestiture of PSNH’s generation assets.

PSNH Funding was formed solely to issue RRBs to finance PSNH's unrecovered remaining costs associated with the divestiture of its generation assets. PSNH Funding is considered a VIE primarily because the equity capitalization is insufficient to support its operations. PSNH has the power to direct the significant activities of the VIE and is most closely associated with the VIE as compared to other interest holders. Therefore, PSNH is considered the primary beneficiary and consolidates PSNH Funding in its consolidated financial statements.

The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements:


(Millions of Dollars)
PSNH Balance Sheets:	As of March 31, 2026		As of December 31, 2025
Restricted Cash - Current Portion (included in Special Deposits)	$	18.4	$	30.6
Restricted Cash - Long-Term Portion (included in Other Long-Term Assets)	3.2		3.2
Securitized Stranded Cost (included in Regulatory Assets)	295.3		306.1
Other Regulatory Liabilities (included in Regulatory Liabilities)	9.1		7.3
Accrued Interest (included in Other Current Liabilities)	1.9		5.1
Rate Reduction Bonds - Current Portion	43.2		43.2
Rate Reduction Bonds - Long-Term Portion	259.3		280.9


(Millions of Dollars) PSNH Income Statements:	For the Three Months Ended
	March 31, 2026		March 31, 2025
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	$	10.8	$	10.8
Interest Expense on RRB Principal (included in Interest Expense)	2.9		3.3

DERIVATIVE INSTRUMENTS - Variations Using Significant unobservable Inputs (Details) - NSTAR Electric - Level 3 $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Derivatives, Net [Rollforward]
Fair Value as of Beginning of Year	$ (662.1)
Net Realized/Unrealized Gains Included in Regulatory Assets and Liabilities	220.5
Settlements	(63.4)
Fair Value as of End of Year	$ (505.0)

EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Components of Basic and Diluted Earnings Per Share

The following table sets forth the components of basic and diluted earnings per share:


Eversource (Millions of Dollars, except share information)	For the Three Months Ended
		March 31, 2026		March 31, 2025
Net Income Attributable to Common Shareholders		$	606.8	$	550.8
Weighted Average Common Shares Outstanding:
Basic		376,026,090		367,320,246
Dilutive Effect		557,524		357,372
Diluted		376,583,614		367,677,618
Basic and Diluted Earnings Per Common Share		$	1.61	$	1.50

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	$ 23,108,600	$ 22,695,300
Distribution - Natural Gas	9,899,000	9,888,000
Transmission - Electric	17,181,800	17,082,400
Distribution - Water	2,608,300	2,577,300
Solar	206,800	206,800
Utility	53,004,500	52,449,800
Other	2,532,600	2,476,300
Property, Plant and Equipment, Gross	55,537,100	54,926,100
Less: Accumulated Depreciation
Utility	(11,114,000)	(10,911,700)
Other	(1,303,900)	(1,246,100)
Total Accumulated Depreciation	(12,417,900)	(12,157,800)
Property, Plant and Equipment, Net	43,119,200	42,768,300
Construction Work in Progress	3,351,000	3,162,700
Total Property, Plant and Equipment, Net	46,470,244	45,930,959
CL&P
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	9,038,700	8,906,000
Transmission - Electric	7,263,700	7,222,500
Solar	0	0
Property, Plant and Equipment, Gross	16,302,400	16,128,500
Less: Accumulated Depreciation
Total Accumulated Depreciation	(3,140,800)	(3,081,300)
Property, Plant and Equipment, Net	13,161,600	13,047,200
Construction Work in Progress	606,400	576,100
Total Property, Plant and Equipment, Net	13,768,014	13,623,296
NSTAR Electric
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	10,870,200	10,635,700
Transmission - Electric	6,749,200	6,722,900
Solar	206,800	206,800
Property, Plant and Equipment, Gross	17,826,200	17,565,400
Less: Accumulated Depreciation
Total Accumulated Depreciation	(4,088,000)	(4,014,200)
Property, Plant and Equipment, Net	13,738,200	13,551,200
Construction Work in Progress	1,831,200	1,757,700
Total Property, Plant and Equipment, Net	15,569,419	15,308,896
PSNH
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	3,239,900	3,193,800
Transmission - Electric	3,170,600	3,138,700
Solar	0	0
Property, Plant and Equipment, Gross	6,410,500	6,332,500
Less: Accumulated Depreciation
Total Accumulated Depreciation	(1,105,200)	(1,085,400)
Property, Plant and Equipment, Net	5,305,300	5,247,100
Construction Work in Progress	264,400	260,600
Total Property, Plant and Equipment, Net	$ 5,569,694	$ 5,507,663

COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) - USD ($) $ in Millions	Mar. 31, 2026	Jan. 31, 2026	Sep. 30, 2024
Guarantor Obligations [Line Items]
Maximum exposure (up to)			$ 850.0
North East Offshore, Revolution Wind, LLC and South Fork Wind, LLC
Guarantor Obligations [Line Items]
Ownership interest (percent)	50.00%
South Fork Class B Member, LLC
Guarantor Obligations [Line Items]
Ownership interest (percent)	50.00%
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,620.0
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 7.1
Ownership interest (percent)	50.00%
Performance Guarantee \| Eversource Investment Service Company LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)			$ 100.0
Tax Equity \| Eversource TEI LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 50.0
Revolution Wind, LLC and TurbineCo, LLC \| Construction-related purchase agreements with third-party contractors
Guarantor Obligations [Line Items]
Maximum exposure (up to)	122.3
Eversource Investment LLC, Eversource Investment Service Company LLC and South Fork Class B Member, LLC \| Funding and indemnification obligations of North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	143.0
Eversource Investment LLC \| Revolution Wind Tax Positions
Guarantor Obligations [Line Items]
Maximum exposure (up to)	300.0
Eversource Investment LLC \| Performance Guarantee
Guarantor Obligations [Line Items]
Maximum exposure (up to)		$ 900.0
Eversource TEI LLC \| South Fork Wind Tax Equity
Guarantor Obligations [Line Items]
Maximum exposure (up to)	50.0
South Fork Wind, LLC \| Power Purchase Guarantee
Guarantor Obligations [Line Items]
Maximum exposure (up to)	7.1
Various Eversource subsidiaries \| Surety Bond
Guarantor Obligations [Line Items]
Maximum exposure (up to)	34.1
North East Offshore, Revolution Wind, LLC, TurbineCo, LLC \| Performance Guarantee
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 682.7

SEGMENT INFORMATION - Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting Information [Line Items]
Operating Revenues	$ 4,504,363	$ 4,118,355
Depreciation and Amortization	(823,300)	(835,000)
Total Operations and Maintenance	(506,980)	(487,451)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	(2,098,000)	(1,869,500)
Operating Income	1,076,148	926,394
Interest Expense	(365,259)	(300,849)
Interest Income	28,400	34,000
Other Income, Net	72,800	58,300
Income Tax (Expense)/Benefit	(203,327)	(165,221)
Net Income	608,721	552,668
Net Income Attributable to Noncontrolling Interests	(1,880)	(1,880)
Net Income Attributable to Common Shareholders	606,841	550,788
Cash Flows Used for Investments in Plant	1,009,300	1,007,400
Assets	64,707,601		$ 63,786,711
Other
Segment Reporting Information [Line Items]
Operating Revenues	484,400	439,000
Depreciation and Amortization	(60,600)	(50,600)
Total Operations and Maintenance	(391,800)	(349,100)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	(800)	(1,400)
Operating Income	31,200	37,900
Interest Expense	(180,200)	(178,400)
Interest Income	39,200	43,400
Other Income, Net	692,200	625,700
Income Tax (Expense)/Benefit	26,500	33,400
Net Income	608,900	562,000
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Common Shareholders	608,900	562,000
Cash Flows Used for Investments in Plant	85,800	50,600
Assets	30,549,200		29,743,300
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(931,900)	(837,800)
Depreciation and Amortization	4,100	2,800
Total Operations and Maintenance	491,100	441,000
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	436,700	394,100
Operating Income	0	100
Interest Expense	39,200	43,400
Interest Income	(39,200)	(43,400)
Other Income, Net	(687,000)	(621,100)
Income Tax (Expense)/Benefit	0	0
Net Income	(687,000)	(621,000)
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Common Shareholders	(687,000)	(621,000)
Cash Flows Used for Investments in Plant	0	0
Assets	(32,360,300)		(31,851,700)
Electric Distribution \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	2,940,500	2,777,700
Depreciation and Amortization	(541,700)	(564,700)
Operations, Excluding Storm Costs	(106,900)	(101,700)
Corporate Shared Services	(121,600)	(116,400)
Storm Costs	(28,900)	(19,900)
Employee Benefits	(39,100)	(48,600)
Uncollectible Expense	(35,600)	(43,700)
Other	(31,300)	(27,400)
Total Operations and Maintenance	(363,400)	(357,700)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	(1,735,000)	(1,580,600)
Operating Income	300,400	274,700
Interest Expense	(100,000)	(91,100)
Interest Income	20,500	27,300
Other Income, Net	45,000	35,300
Income Tax (Expense)/Benefit	(61,900)	(56,600)
Net Income	204,000	189,600
Net Income Attributable to Noncontrolling Interests	(1,200)	(1,200)
Net Income Attributable to Common Shareholders	202,800	188,400
Cash Flows Used for Investments in Plant	458,900	489,600
Assets	35,382,000		34,858,100
Natural Gas Distribution \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	1,373,200	1,141,400
Depreciation and Amortization	(97,500)	(104,500)
Operations, Excluding Storm Costs	(50,700)	(46,200)
Corporate Shared Services	(30,400)	(30,300)
Storm Costs	0	0
Employee Benefits	(20,900)	(18,600)
Uncollectible Expense	(33,500)	(30,000)
Other	(300)	2,100
Total Operations and Maintenance	(135,800)	(123,000)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	(717,900)	(605,200)
Operating Income	422,000	308,700
Interest Expense	(34,000)	(28,400)
Interest Income	7,800	6,700
Other Income, Net	6,700	5,500
Income Tax (Expense)/Benefit	(107,200)	(74,100)
Net Income	295,300	218,400
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Common Shareholders	295,300	218,400
Cash Flows Used for Investments in Plant	152,100	193,900
Assets	10,919,000		10,865,500
Electric Transmission \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	584,600	547,800
Depreciation and Amortization	(115,200)	(106,800)
Operations, Excluding Storm Costs	(34,700)	(31,500)
Corporate Shared Services	(21,700)	(21,800)
Storm Costs	0	0
Employee Benefits	(11,700)	(11,700)
Uncollectible Expense	0	0
Other	(16,300)	(10,900)
Total Operations and Maintenance	(84,400)	(75,900)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	(74,100)	(69,600)
Operating Income	310,900	295,500
Interest Expense	(83,100)	(38,600)
Interest Income	100	0
Other Income, Net	14,200	12,100
Income Tax (Expense)/Benefit	(61,000)	(68,900)
Net Income	181,100	200,100
Net Income Attributable to Noncontrolling Interests	(700)	(700)
Net Income Attributable to Common Shareholders	180,400	199,400
Cash Flows Used for Investments in Plant	281,700	244,800
Assets	17,227,400		17,193,900
Water Distribution \| Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	53,600	50,300
Depreciation and Amortization	(12,400)	(11,200)
Total Operations and Maintenance	(22,700)	(22,800)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency	(6,900)	(6,800)
Operating Income	11,600	9,500
Interest Expense	(7,200)	(7,700)
Interest Income	0	0
Other Income, Net	1,700	800
Income Tax (Expense)/Benefit	300	1,000
Net Income	6,400	3,600
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Common Shareholders	6,400	3,600
Cash Flows Used for Investments in Plant	30,800	$ 28,500
Assets	$ 2,990,300		$ 2,977,600

REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended
REVENUES (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 4,538,000	$ 4,106,500
Alternative Revenue Programs	(40,700)	4,500
Other Revenues	7,100	7,400
Total Operating Revenues	4,504,363	4,118,355
CL&P
Disaggregation of Revenue [Line Items]
Total Operating Revenues	1,568,126	1,541,189
NSTAR Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	1,131,088	1,014,227
PSNH
Disaggregation of Revenue [Line Items]
Total Operating Revenues	383,517	347,981
Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,757,300	3,511,000
Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,345,200	2,217,200
Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,236,200	1,126,800
Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	175,900	167,000
Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	166,000	154,700
Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	581,700	411,200
Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	33,000	29,600
Operating Segments \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,784,000	1,733,500
Alternative Revenue Programs	(32,500)	(18,900)
Other Revenues	2,200	2,700
Operating Segments \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,333,500	1,200,600
Alternative Revenue Programs	(16,300)	(9,100)
Other Revenues	2,400	2,400
Operating Segments \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	467,200	434,100
Alternative Revenue Programs	(15,600)	(19,700)
Other Revenues	1,200	900
Operating Segments \| Total Retail Tariff Sales Revenues \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,131,100	1,193,700
Operating Segments \| Total Retail Tariff Sales Revenues \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	940,400	912,700
Operating Segments \| Total Retail Tariff Sales Revenues \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	327,600	295,100
Operating Segments \| Residential \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	787,700	801,200
Operating Segments \| Residential \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	471,200	506,200
Operating Segments \| Residential \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	208,900	181,900
Operating Segments \| Commercial \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	304,400	344,100
Operating Segments \| Commercial \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	434,500	375,700
Operating Segments \| Commercial \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	94,700	88,300
Operating Segments \| Industrial \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	39,000	48,400
Operating Segments \| Industrial \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	34,700	30,800
Operating Segments \| Industrial \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	24,000	24,900
Operating Segments \| Wholesale Transmission Revenues \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	269,200	251,100
Operating Segments \| Wholesale Transmission Revenues \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	236,400	218,700
Operating Segments \| Wholesale Transmission Revenues \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	126,700	124,200
Operating Segments \| Wholesale Market Sales Revenues \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	368,700	280,000
Operating Segments \| Wholesale Market Sales Revenues \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	143,300	57,300
Operating Segments \| Wholesale Market Sales Revenues \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	9,200	10,500
Operating Segments \| Other Revenues from Contracts with Customers \| CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	15,000	8,700
Operating Segments \| Other Revenues from Contracts with Customers \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	13,400	11,900
Operating Segments \| Other Revenues from Contracts with Customers \| PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,700	4,300
Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	484,400	439,000
Alternative Revenue Programs	0	0
Other Revenues	0	0
Total Operating Revenues	484,400	439,000
Other \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	484,400	439,000
Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(961,600)	(883,000)
Alternative Revenue Programs	29,700	45,200
Other Revenues	0	0
Total Operating Revenues	(931,900)	(837,800)
Eliminations \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(10,000)	(7,900)
Eliminations \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Eliminations \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(3,500)	(2,000)
Eliminations \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(6,500)	(5,900)
Eliminations \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(466,300)	(439,300)
Eliminations \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Eliminations \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(485,300)	(435,800)
Consolidations Eliminations \| CL&P
Disaggregation of Revenue [Line Items]
Total Operating Revenues	(185,600)	(176,100)
Consolidations Eliminations \| NSTAR Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	(188,500)	(179,700)
Consolidations Eliminations \| PSNH
Disaggregation of Revenue [Line Items]
Total Operating Revenues	(69,300)	(67,300)
Electric Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,940,300	2,769,600
Alternative Revenue Programs	(5,500)	2,200
Other Revenues	5,700	5,900
Total Operating Revenues	2,940,500	2,777,700
Electric Distribution \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,398,600	2,401,000
Electric Distribution \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,467,800	1,489,300
Electric Distribution \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	833,100	807,600
Electric Distribution \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	97,700	104,100
Electric Distribution \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Distribution \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	521,200	347,800
Electric Distribution \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	20,500	20,800
Natural Gas Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,379,700	1,133,900
Alternative Revenue Programs	(7,600)	6,400
Other Revenues	1,100	1,100
Total Operating Revenues	1,373,200	1,141,400
Natural Gas Distribution \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,318,700	1,070,200
Natural Gas Distribution \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	844,700	696,500
Natural Gas Distribution \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	390,400	305,900
Natural Gas Distribution \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	83,600	67,800
Natural Gas Distribution \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Natural Gas Distribution \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	59,400	62,300
Natural Gas Distribution \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,600	1,400
Electric Transmission \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	643,400	597,600
Alternative Revenue Programs	(58,900)	(49,900)
Other Revenues	100	100
Total Operating Revenues	584,600	547,800
Electric Transmission \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	632,300	594,000
Electric Transmission \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	11,100	3,600
Water Distribution \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	51,800	49,400
Alternative Revenue Programs	1,600	600
Other Revenues	200	300
Total Operating Revenues	53,600	50,300
Water Distribution \| Operating Segments \| Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	50,000	47,700
Water Distribution \| Operating Segments \| Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	32,700	31,400
Water Distribution \| Operating Segments \| Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	16,200	15,300
Water Distribution \| Operating Segments \| Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,100	1,000
Water Distribution \| Operating Segments \| Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Water Distribution \| Operating Segments \| Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,100	1,100
Water Distribution \| Operating Segments \| Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 700	$ 600

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current Assets:
Cash	$ 270,184	$ 135,351
Receivables, Net (net of allowance for uncollectible accounts)	2,080,805	1,847,094
Unbilled Revenues	217,605	275,108
Materials, Supplies and REC Inventory	489,415	491,592
Regulatory Assets	1,897,191	1,975,083
Prepayments and Other Current Assets	389,535	352,958
Total Current Assets	5,344,735	5,077,186
Property, Plant and Equipment, Net	46,470,244	45,930,959
Deferred Debits and Other Assets:
Regulatory Assets	5,768,159	5,718,646
Prepaid Pension and PBOP	1,566,418	1,511,169
Other Long-Term Assets	1,002,089	997,883
Total Deferred Debits and Other Assets	12,892,622	12,778,566
Total Assets	64,707,601	63,786,711
Current Liabilities:
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,662,046	1,859,692
Regulatory Liabilities	1,739,987	1,264,609
Other Current Liabilities	1,290,226	1,274,450
Total Current Liabilities	8,209,723	7,808,512
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,894,583	5,647,218
Regulatory Liabilities	4,323,619	4,273,465
Other Long-Term Liabilities	1,138,347	1,101,932
Total Deferred Credits and Other Liabilities	12,690,972	12,472,065
Long-Term Debt	26,861,131	26,872,433
Rate Reduction Bonds	259,257	280,862
Common Shareholders' Equity:
Capital Surplus, Paid In	9,950,113	9,937,878
Retained Earnings	4,815,846	4,504,983
Common Shareholders' Equity	16,530,950	16,197,271
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	64,707,601	63,786,711
PSNH
Current Assets:
Cash	3,096	13,665
Unbilled Revenues	53,816	62,446
Materials, Supplies and REC Inventory	63,988	58,879
Regulatory Assets	101,449	119,871
Special Deposits	22,274	38,343
Prepayments and Other Current Assets	2,239	19,212
Total Current Assets	513,255	550,871
Property, Plant and Equipment, Net	5,569,694	5,507,663
Deferred Debits and Other Assets:
Regulatory Assets	870,534	841,203
Prepaid Pension and PBOP	117,031	111,833
Other Long-Term Assets	20,774	17,661
Total Deferred Debits and Other Assets	1,008,339	970,697
Total Assets	7,091,288	7,029,231
Current Liabilities:
Notes Payable to Eversource Parent	79,400	49,300
Rate Reduction Bonds – Current Portion	43,210	43,210
Obligations to Third Party Suppliers	36,361	37,584
Accrued Interest	31,300	35,224
Regulatory Liabilities	134,115	118,443
Other Current Liabilities	71,076	62,334
Total Current Liabilities	587,350	570,509
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	817,188	806,270
Regulatory Liabilities	425,128	417,442
Other Long-Term Liabilities	53,482	46,669
Total Deferred Credits and Other Liabilities	1,295,798	1,270,381
Long-Term Debt	2,031,850	2,031,323
Rate Reduction Bonds	259,257	280,862
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	1,973,134	1,973,134
Retained Earnings	943,899	903,022
Common Shareholders' Equity	2,917,033	2,876,156
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	7,091,288	7,029,231
PSNH \| Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	240,524	214,117
Current Liabilities:
Accounts Payable	139,305	179,137
PSNH \| Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	25,869	24,338
Current Liabilities:
Notes Payable to Eversource Parent	79,400	49,300
Accounts Payable	$ 52,583	$ 45,277