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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Provision for Uncollectible Accounts

The activity in the allowance for uncollectible accounts by portfolio segment 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 (2)
Balance as of January 1, 2021			$	194.8					$	164.1					$	358.9					$	129.1					$	28.3					$	157.4					$	39.7					$	51.9					$	91.6					$	17.2
Uncollectible Expense			—						60.9						60.9						—						13.5						13.5						—						16.6						16.6						13.1
Uncollectible Costs Deferred (1)			51.9						58.7						110.6						32.3						25.5						57.8						4.3						15.8						20.1						3.1
Write-Offs			(22.0)						(107.7)						(129.7)						(18.0)						(36.2)						(54.2)						(0.7)						(36.3)						(37.0)						(10.0)
Recoveries Collected			1.4						15.3						16.7						1.2						5.6						6.8						—						5.7						5.7						0.9
Balance as of December 31, 2021			$	226.1					$	191.3					$	417.4					$	144.6					$	36.7					$	181.3					$	43.3					$	53.7					$	97.0					$	24.3
Uncollectible Expense			—						61.9						61.9						—						15.6						15.6						—						21.6						21.6						9.2
Uncollectible Costs Deferred (1)			77.8						34.7						112.5						58.3						1.2						59.5						1.5						10.9						12.4						2.5
Write-Offs			(21.3)						(102.7)						(124.0)						(15.3)						(23.0)						(38.3)						(1.1)						(41.2)						(42.3)						(7.7)
Recoveries Collected			1.8						16.7						18.5						1.3						5.9						7.2						—						6.3						6.3						0.9
Balance as of December 31, 2022			$	284.4					$	201.9					$	486.3					$	188.9					$	36.4					$	225.3					$	43.7					$	51.3					$	95.0					$	29.2
Uncollectible Expense			—						72.5						72.5						—						11.7						11.7						—						22.8						22.8						4.0
Uncollectible Costs Deferred (1)			137.0						21.2						158.2						114.4						12.0						126.4						1.5						16.0						17.5						(8.7)
Write-Offs			(55.9)						(122.2)						(178.1)						(44.7)						(28.5)						(73.2)						(1.6)						(41.7)						(43.3)						(10.9)
Recoveries Collected			1.3						14.3						15.6						1.1						4.7						5.8						—						5.0						5.0						0.7
Balance as of December 31, 2023			$	366.8					$	187.7					$	554.5					$	259.7					$	36.3					$	296.0					$	43.6					$	53.4					$	97.0					$	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 and COVID-19. The increase in the allowance for uncollectible hardship accounts in both 2023 and 2022 at Eversource and CL&P primarily relates to increased customer enrollment in disconnection prevention programs in Connecticut.

(2)    In connection with PSNH’s pole purchase agreement on May 1, 2023, the purchase price included the forgiveness of previously reserved receivables for reimbursement of operation and maintenance and vegetation management costs.

Schedule of Utility Inventory

The carrying amounts of materials and supplies, natural gas inventory, and RECs, which are included in Current Assets on the balance sheets, were as follows:

			As of December 31,
			2023																								2022
(Millions of Dollars)			Eversource						CL&P						NSTAR Electric						PSNH						Eversource						CL&P						NSTAR Electric						PSNH
Materials and Supplies			$	397.9					$	156.2					$	130.8					$	76.5					$	221.0					$	88.2					$	81.0					$	34.4
Natural Gas			65.5						—						—						—						95.9						—						—						—
RECs			43.9						0.3						43.0						0.6						57.5						—						57.4						0.1
Total			$	507.3					$	156.5					$	173.8					$	77.1					$	374.4					$	88.2					$	138.4					$	34.5

Costs Related to Fuel and Natural Gas

The cost of natural gas included in Purchased Power, Purchased Natural Gas and Transmission on the statements of income were as follows:

			For the Years Ended December 31,
(Millions of Dollars)			2023						2022						2021
Eversource - Cost of Natural Gas			$	792.2					$	1,010.2					$	718.6

Weighted-Average AFUDC Rates

AFUDC costs and the weighted-average AFUDC rates were as follows:

Eversource			For the Years Ended December 31,
(Millions of Dollars, except percentages)			2023						2022						2021
Borrowed Funds			$	44.6					$	21.8					$	18.4
Equity Funds			78.1						47.3						37.3
Total AFUDC			$	122.7					$	69.1					$	55.7
Average AFUDC Rate			5.8		%				4.7		%				4.2		%

			For the Years Ended December 31,
			2023																		2022																		2021
(Millions of Dollars, except percentages)			CL&P						NSTAR Electric						PSNH						CL&P						NSTAR Electric						PSNH						CL&P						NSTAR Electric						PSNH
Borrowed Funds			$	7.7					$	17.2					$	6.1					$	4.8					$	10.7					$	1.4					$	2.9					$	9.0					$	0.8
Equity Funds			20.0						45.7						5.4						13.6						24.6						2.5						7.7						20.4						1.6
Total AFUDC			$	27.7					$	62.9					$	11.5					$	18.4					$	35.3					$	3.9					$	10.6					$	29.4					$	2.4
Average AFUDC Rate			6.7		%				5.9		%				5.1		%				6.6		%				5.4		%				2.6		%				5.0		%				4.9		%				2.5		%

Components of Other Income, Net

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

Eversource			For the Years Ended December 31,
(Millions of Dollars)			2023						2022						2021
Pension, SERP and PBOP Non-Service Income Components,   Net of Deferred Portion (1)			$	132.9					$	219.8					$	84.4
AFUDC Equity			78.1						47.3						37.3
Equity in Earnings of Unconsolidated Affiliates (2)			15.5						22.9						14.2
Investment (Loss)/Income			(4.9)						1.9						(0.2)
Interest Income			94.2						50.5						25.6
Other (2)			32.3						3.7						—
Total Other Income, Net			$	348.1					$	346.1					$	161.3

			For the Years Ended December 31,
			2023																		2022																		2021
(Millions of Dollars)			CL&P						NSTAR Electric						PSNH						CL&P						NSTAR Electric						PSNH						CL&P						NSTAR Electric						PSNH
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion (1)			$	34.9					$	57.4					$	16.2					$	64.4					$	85.5					$	26.8					$	15.2					$	40.2					$	10.3
AFUDC Equity			20.0						45.7						5.4						13.6						24.6						2.5						7.7						20.4						1.6
Investment (Loss)/Income			(2.4)						(0.2)						(0.7)						(1.3)						1.2						0.2						1.3						0.1						0.1
Interest Income			9.0						60.6						5.3						6.5						30.7						3.1						5.9						13.4						2.4
Other			0.1						0.6						0.4						0.1						0.7						0.1						0.1						0.7						0.2
Total Other Income, Net			$	61.6					$	164.1					$	26.6					$	83.3					$	142.7					$	32.7					$	30.2					$	74.8					$	14.6

(1)    See Note 11A, "Employee Benefits – Pension Benefits and Postretirement Benefits Other Than Pension," for the components of net periodic benefit income/expense for the Pension, SERP and PBOP Plans. The non-service related components of pension, SERP and PBOP benefit income/expense, after capitalization or deferral, are presented as non-operating income and recorded in Other Income, Net on the statements of income.

(2)    Eversource’s equity method investment in a renewable energy fund was liquidated in March 2023. Liquidation proceeds in excess of the carrying value were recorded in 2023 within Other in the table above. See Note 6, “Investments in Unconsolidated Affiliates,” for further information. For the years ended December 31, 2022 and 2021, pre-tax income of $12.2 million and $2.1 million, respectively, associated with this investment was included in Equity in Earnings of Unconsolidated Affiliates within Other Income, Net in the table above.

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 Years Ended December 31,
(Millions of Dollars)			2023						2022						2021
Eversource			$	202.9					$	194.7					$	181.9
CL&P			174.9						166.1						158.1

Supplemental Cash Flow Information

Eversource (Millions of Dollars)			As of and For the Years Ended December 31,
			2023						2022						2021
Cash Paid During the Year for:
Interest, Net of Amounts Capitalized			$	783.2					$	636.2					$	568.7
Income Taxes			39.2						77.9						121.6
Non-Cash Investing Activities:
Plant Additions Included in Accounts Payable (As of)			564.1						586.9						467.9

			As of and For the Years Ended December 31,
			2023																		2022																		2021
(Millions of Dollars)			CL&P						NSTAR Electric						PSNH						CL&P						NSTAR Electric						PSNH						CL&P						NSTAR Electric						PSNH
Cash Paid/(Received) During the Year for:
Interest, Net of Amounts Capitalized			$	176.8					$	182.8					$	62.8					$	167.2					$	152.8					$	58.3					$	161.5					$	141.6					$	56.5
Income Taxes			(44.1)						31.3						(59.9)						117.6						23.8						58.3						38.4						74.2						51.1
Non-Cash Investing Activities:
Plant Additions Included in Accounts   Payable (As of)			139.8						178.9						65.9						131.8						184.3						76.2						110.6						120.0						68.7

Cash and Cash Equivalents as Reported on the Balance Sheet

			As of December 31,
			2023																								2022
(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			$	53.9					$	10.2					$	6.7					$	0.2					$	374.6					$	11.3					$	327.7					$	0.1
Restricted cash included in:
Special Deposits			81.5						2.0						16.1						31.6						102.2						8.8						17.5						33.1
Marketable Securities			13.7						—						—						—						25.4						0.2						0.1						0.4
Other Long-Term Assets			17.3						—						—						3.2						19.6						—						—						3.2
Cash, Cash Equivalents and Restricted Cash     as reported on the Statements of Cash Flows			$	166.4					$	12.2					$	22.8					$	35.0					$	521.8					$	20.3					$	345.3					$	36.8

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