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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]  
Schedule of Provision for Uncollectible Accounts The activity in the allowance for uncollectible accounts by portfolio segment is as follows:
EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Hardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total Allowance
Total Allowance (3)
Balance as of January 1, 2023$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 Collected1.3 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 
Uncollectible Expense— 74.1 74.1 — 17.2 17.2 — 33.6 33.6 4.7 
Uncollectible Costs Deferred (1)
71.4 48.3 119.7 35.5 11.3 46.8 16.2 21.5 37.7 5.1 
Write-Offs(74.3)(129.5)(203.8)(55.1)(30.9)(86.0)(4.6)(52.4)(57.0)(10.9)
Recoveries Collected0.7 13.3 14.0 0.6 4.5 5.1 — 3.6 3.6 0.9 
Reclassified as Held for Sale (2)
— (2.3)(2.3)— — — — — — — 
Balance as of December 31, 2024$364.6 $191.6 $556.2 $240.7 $38.4 $279.1 $55.2 $59.7 $114.9 $14.1 
Uncollectible Expense— 101.1 101.1 — 17.9 17.9 — 41.4 41.4 12.0 
Uncollectible Costs Deferred (1)
62.4 57.6 120.0 32.0 11.1 43.1 8.3 28.8 37.1 7.2 
Write-Offs(61.9)(154.2)(216.1)(48.5)(39.1)(87.6)(2.9)(63.7)(66.6)(10.5)
Recoveries Collected2.1 14.9 17.0 1.5 4.5 6.0 0.1 5.7 5.8 0.7 
Reclassified from Held for Sale (2)
— 2.3 2.3 — — — — — — — 
Balance as of December 31, 2025$367.2 $213.3 $580.5 $225.7 $32.8 $258.5 $60.7 $71.9 $132.6 $23.5 

(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.

(2)    As of December 31, 2025 and 2023, the allowance for uncollectible accounts attributable to the Aquarion water distribution business are recorded within Receivables, Net on the Eversource balance sheet. As of December 31, 2024, this balance was classified as Assets Held for Sale on the Eversource balance sheet. For further information, see Note 24, “Assets Held for Sale.”

(3)    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,
 20252024
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Materials and Supplies$400.7 $133.9 $172.8 $55.8 $498.6 $217.3 $177.8 $72.1 
Natural Gas 49.7 — — — 49.5 — — — 
RECs41.2 — 38.1 `3.1 46.5 — 42.8 3.7 
Total$491.6 $133.9 $210.9 $58.9 $594.6 $217.3 $220.6 $75.8 
Schedule of 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 was as follows:
 For the Years Ended December 31,
(Millions of Dollars)202520242023
Eversource - Cost of Natural Gas$857.0 $689.6 $792.2 
Schedule of Weighted-Average AFUDC Rates
AFUDC costs and the weighted-average AFUDC rates were as follows:
EversourceFor the Years Ended December 31,
(Millions of Dollars, except percentages)202520242023
Borrowed Funds$64.1 $64.4 $44.6 
Equity Funds99.0 97.8 78.1 
Total AFUDC$163.1 $162.2 $122.7 
Average AFUDC Rate6.4 %6.5 %5.8 %
 For the Years Ended December 31,
 202520242023
(Millions of Dollars,
except percentages)		CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Borrowed Funds$14.5 $28.9 $5.7 $8.1 $27.2 $8.9 $7.7 $17.2 $6.1 
Equity Funds12.2 58.4 13.0 22.4 58.8 7.0 20.0 45.7 5.4 
Total AFUDC$26.7 $87.3 $18.7 $30.5 $86.0 $15.9 $27.7 $62.9 $11.5 
Average AFUDC Rate6.0 %6.7 %7.3 %6.7 %7.0 %5.5 %6.7 %5.9 %5.1 %
Schedule of Components of Other Income, Net
The components of Other Income, Net on the statements of income were as follows:
EversourceFor the Years Ended December 31,
(Millions of Dollars)202520242023
Pension, SERP and PBOP Non-Service Income Components,
  Net of Deferred Portion (1)
$139.3 $115.4 $132.9 
AFUDC Equity99.0 97.8 78.1 
Equity in Earnings of Unconsolidated Affiliates (2)
19.9 51.9 15.5 
Investment (Loss)/Income(5.4)0.6 (4.9)
Interest Income125.5 138.2 94.2 
Other (2)
0.6 6.6 32.3 
Total Other Income, Net$378.9 $410.5 $348.1 
 For the Years Ended December 31,
 202520242023
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Pension, SERP and PBOP Non-Service Income Components, Net of Deferred Portion (1)
$36.2 $61.4 $17.6 $28.2 $52.8 $14.9 $34.9 $57.4 $16.2 
AFUDC Equity12.2 58.4 13.0 22.4 58.8 7.0 20.0 45.7 5.4 
Investment (Loss)/Income(1.7)(1.6)(0.7)(1.4)1.9 (0.5)(2.4)(0.2)(0.7)
Interest Income12.9 72.7 13.0 28.3 77.0 9.6 9.0 60.6 5.3 
Other0.1 1.7 0.1 0.1 0.9 0.1 0.1 0.6 0.4 
Total Other Income, Net$59.7 $192.6 $43.0 $77.6 $191.4 $31.1 $61.6 $164.1 $26.6 

(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)    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 previously-held wind equity method investment, North East Offshore, as a result of a vendor settlement agreement payment received by the joint venture. In the third quarter of 2024, Eversource sold its equity method investments in three offshore wind projects. In March 2023, Eversource’s equity method investment in a renewable energy fund was liquidated. 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 on the 2024 sales of the offshore wind investments and the 2023 liquidation of the renewable energy fund.
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 Years Ended December 31,
(Millions of Dollars)202520242023
Eversource$232.4 $209.4 $202.9 
CL&P203.8 185.1 174.9 
Schedule of Supplemental Cash Flow Information
Eversource
(Millions of Dollars)
As of and For the Years Ended December 31,
202520242023
Cash Paid During the Year for:  
Interest, Net of Amounts Capitalized$1,182.6 $1,014.4 $783.2 
Non-Cash Investing Activities:
Plant Additions Included in Accounts Payable (As of)508.2 472.5 564.1 
 As of and For the Years Ended December 31,
 202520242023
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Cash Paid During the Year for:         
Interest, Net of Amounts Capitalized$208.4 $232.4 $83.9 $216.8 $215.1 $78.4 $176.8 $182.8 $62.8 
Non-Cash Investing Activities:  
Plant Additions Included in Accounts
  Payable (As of)		143.2 160.5 59.2 95.8 155.4 77.7 139.8 178.9 65.9 
Income Taxes Paid: The following tables present income taxes paid, net of refunds received, disaggregated by jurisdiction. The jurisdictions presented include federal, state, and any individual jurisdictions where the amount of income taxes paid equals or exceeds five percent of the total income taxes paid during the reporting period.
Eversource
(Millions of Dollars)
For the Years Ended December 31,
202520242023
Cash Paid/(Received) for Income Taxes, Net of Refunds:  
Federal Income Taxes$(48.8)
State Income Taxes:
Connecticut 6.2 
Massachusetts(8.7)
Other2.9 
State Income Taxes0.4 
Total Cash Paid/(Received) for Income Taxes, Net of Refunds$(48.4)
Total Cash Paid/(Received) for Income Taxes (Prior to ASU 2023-09)$(69.6)$39.2 
 For the Years Ended December 31,
 202520242023
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Cash Paid for Income Taxes, Net of Refunds:         
Federal Income Taxes$113.1 $124.5 $60.0 
State Income Taxes:
Connecticut22.4 — — 
Massachusetts(a)40.3 (a)
New Hampshire— — 22.9 
   Other0.2 — 0.1 
State Income Taxes22.6 40.3 23.0 
Total Cash Paid for Income Taxes, Net of Refunds$135.7 $164.8 $83.0 
Total Cash Paid/(Received) for Income Taxes (Prior to ASU 2023-09)$(47.4)$118.7 $(36.0)$(44.1)$31.3 $(59.9)

(a) Did not meet the five percent threshold required for separate disclosure.
Schedule of Cash and Cash Equivalents as Reported on the Balance Sheet
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 December 31,
 20252024
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Cash as reported on the Balance Sheets$135.4 $87.6 $8.3 $13.7 $26.7 $1.1 $0.9 $1.4 
Restricted cash included in:
Special Deposits93.6 1.1 17.6 38.3 75.8 1.0 8.1 32.7 
Assets Held for Sale, Current— — — — 5.8 — — — 
Marketable Securities14.0 — — — 10.0 — — — 
Other Long-Term Assets3.2 — — 3.2 9.0 — — 3.1 
Cash and Restricted Cash as reported on the
   Statements of Cash Flows		$246.2 $88.7 $25.9 $55.2 $127.3 $2.1 $9.0 $37.2