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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:
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 AllowanceTotal 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 Collected0.4 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 Collected0.1 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, 2026March 31, 2025
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
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 Equity23.9 4.6 15.7 2.3 23.9 3.6 14.1 3.9 
Equity in Earnings of Unconsolidated Affiliates3.8 — 0.1 — 6.0 — 0.2 — 
Investment Income/(Loss)0.3 (0.1)0.4 — (2.0)0.1 (1.8)0.1 
Interest Income28.4 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, 2026March 31, 2025
Eversource$68.1 $63.7 
CL&P52.9 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, 2026As of March 31, 2025
Eversource$346.5 $427.2 
CL&P113.8 82.3 
NSTAR Electric117.1 172.8 
PSNH39.1 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, 2026As of December 31, 2025
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
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 Deposits56.2 1.1 — 22.2 93.6 1.1 17.6 38.3 
Marketable Securities8.2 — — — 14.0 — — — 
Other Long-Term Assets3.2 — — 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