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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Sep. 30, 2025

Accounting Policies [Abstract]

Schedule of Allowance for Uncollectible Accounts

The activity in the allowance for uncollectible accounts by portfolio segment as of September 30th 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 July 1, 2025			$	377.0					$	198.6					$	575.6					$	236.3					$	37.3					$	273.6					$	60.3					$	59.9					$	120.2					$	15.0
Uncollectible Expense			—						18.1						18.1						—						6.0						6.0						—						8.2						8.2						1.5
Uncollectible Costs Deferred (1)			(0.1)						13.7						13.6						(3.2)						2.8						(0.4)						(1.0)						8.2						7.2						2.0
Write-Offs			(18.1)						(42.1)						(60.2)						(14.2)						(8.7)						(22.9)						(0.5)						(18.6)						(19.1)						(3.2)
Recoveries Collected			0.5						3.3						3.8						0.2						1.2						1.4						—						1.3						1.3						0.2
Balance as of September 30, 2025			$	359.3					$	191.6					$	550.9					$	219.1					$	38.6					$	257.7					$	58.8					$	59.0					$	117.8					$	15.5
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			—						59.6						59.6						—						16.1						16.1						—						22.2						22.2						3.9
Uncollectible Costs Deferred (1)			34.2						39.3						73.5						8.8						7.6						16.4						5.7						19.5						25.2						4.6
Write-Offs			(40.3)						(109.5)						(149.8)						(30.8)						(26.9)						(57.7)						(2.1)						(46.6)						(48.7)						(7.7)
Recoveries Collected			0.8						10.6						11.4						0.4						3.4						3.8						—						4.2						4.2						0.6
Balance as of September 30, 2025			$	359.3					$	191.6					$	550.9					$	219.1					$	38.6					$	257.7					$	58.8					$	59.0					$	117.8					$	15.5

			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 July 1, 2024			$	389.1					$	190.5					$	579.6					$	274.4					$	34.2					$	308.6					$	45.9					$	60.3					$	106.2					$	14.1
Uncollectible Expense			—						29.2						29.2						—						5.1						5.1						—						15.7						15.7						1.2
Uncollectible Costs Deferred (1)			5.4						16.0						21.4						(8.8)						3.4						(5.4)						10.1						8.2						18.3						1.4
Write-Offs			(16.8)						(41.3)						(58.1)						(12.2)						(7.4)						(19.6)						(1.9)						(20.3)						(22.2)						(3.2)
Recoveries Collected			0.1						2.5						2.6						0.1						1.0						1.1						—						0.3						0.3						0.2
Balance as of September 30, 2024			$	377.8					$	196.9					$	574.7					$	253.5					$	36.3					$	289.8					$	54.1					$	64.2					$	118.3					$	13.7
Balance as of January 1, 2024			$	366.8					$	187.7					$	554.5					$	259.7					$	36.3					$	296.0					$	43.6					$	53.4					$	97.0					$	14.3
Uncollectible Expense			—						55.4						55.4						—						11.4						11.4						—						27.7						27.7						3.4
Uncollectible Costs Deferred (1)			58.9						37.5						96.4						29.3						8.7						38.0						13.6						17.3						30.9						3.8
Write-Offs			(48.5)						(93.1)						(141.6)						(36.0)						(23.4)						(59.4)						(3.1)						(36.6)						(39.7)						(8.4)
Recoveries Collected			0.6						9.4						10.0						0.5						3.3						3.8						—						2.4						2.4						0.6
Balance as of September 30, 2024			$	377.8					$	196.9					$	574.7					$	253.5					$	36.3					$	289.8					$	54.1					$	64.2					$	118.3					$	13.7

(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
			September 30, 2025																								September 30, 2024
(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			$	35.6					$	9.3					$	15.6					$	4.5					$	31.6					$	7.7					$	13.9					$	3.9
AFUDC Equity (1)			19.7						(1.2)						14.3						2.2						22.7						5.4						13.0						1.5
Equity in Earnings of Unconsolidated Affiliates			4.5						—						0.2						—						17.1						—						0.2						—
Investment Loss			(2.8)						(1.0)						(0.7)						(0.4)						(2.1)						(0.9)						(0.2)						(0.3)
Interest Income			29.4						2.9						17.6						2.7						38.9						9.7						20.6						3.0
Other			(0.6)						—						0.1						—						4.4						—						—						—
Total Other Income, Net			$	85.8					$	10.0					$	47.1					$	9.0					$	112.6					$	21.9					$	47.5					$	8.1
			For the Nine Months Ended
			September 30, 2025																								September 30, 2024
(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			$	103.7					$	26.9					$	45.8					$	13.2					$	89.4					$	21.4					$	39.5					$	11.2
AFUDC Equity			69.2						3.9						43.1						10.6						73.2						16.9						44.4						5.1
Equity in Earnings of Unconsolidated Affiliates (2)			15.3						—						0.6						—						48.1						—						0.6						—
Investment (Loss)/Income			(6.8)						(1.8)						(2.7)						(0.7)						(1.8)						(1.7)						0.7						(0.5)
Interest Income			94.2						11.0						54.2						10.4						106.0						24.8						57.8						7.1
Other			(2.1)						0.1						0.1						—						4.0						—						—						—
Total Other Income, Net			$	273.5					$	40.1					$	141.1					$	33.5					$	318.9					$	61.4					$	143.0					$	22.9

(1)    As part of the annual FERC Transmission Formula Rate protocols process, the AFUDC calculation methodology utilized in formula transmission rates was updated effective January 1, 2025. This calculation methodology resulted in an adjustment to the AFUDC equity and AFUDC debt amounts recognized on the statement of income in the third quarter of 2025 in accordance with the AFUDC policy.

(2)    Equity in Earnings of Unconsolidated Affiliates includes $23.4 million of pre-tax income recorded at Eversource in the second quarter of 2024 from Eversource’s previous wind equity method investment, North East Offshore, as a result of a vendor settlement agreement payment received by the joint venture. This settlement payment reduced the required capital contributions to be made by Eversource to North East Offshore during the second quarter of 2024.

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												For the Nine Months Ended
(Millions of Dollars)			September 30, 2025						September 30, 2024						September 30, 2025						September 30, 2024
Eversource			$	62.4					$	59.3					$	176.8					$	157.2
CL&P			58.8						56.0						157.3						139.6

Schedule of Non-Cash Investing Activities

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

(Millions of Dollars)			As of September 30, 2025						As of September 30, 2024
Eversource			$	423.8					$	458.6
CL&P			88.0						73.0
NSTAR Electric			128.0						164.8
PSNH			60.9						67.5

Schedule of Reconciliation of Cash Balances to Cash and Restricted Cash

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

			As of September 30, 2025																								As of December 31, 2024
(Millions of Dollars)			Eversource						CL&P						NSTAR Electric						PSNH						Eversource						CL&P						NSTAR Electric						PSNH
Cash and Cash Equivalents as reported on the Balance Sheets			$	259.3					$	152.4					$	18.6					$	1.8					$	26.7					$	1.1					$	0.9					$	1.4
Restricted cash included in:
Special Deposits			85.5						1.0						29.3						19.6						75.8						1.0						8.1						32.7
Assets Held for Sale, Current			5.9						—						—						—						5.8						—						—						—
Marketable Securities			10.3						—						—						—						10.0						—						—						—
Other Long-Term Assets			5.7						—						—						3.2						9.0						—						—						3.1
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows			$	366.7					$	153.4					$	47.9					$	24.6					$	127.3					$	2.1					$	9.0					$	37.2

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