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EMPLOYEE BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2025
Postemployment Benefits [Abstract]  
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets The following tables provide information on the plan benefit obligations, fair values of plan assets, and funded status:  
 Pension and SERP
As of December 31,
 20252024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Change in Benefit Obligation:      
Benefit Obligation as of Beginning of Year$(4,745.7)$(982.9)$(1,003.5)$(521.5)$(5,238.4)$(1,048.5)$(1,107.0)$(562.3)
Service Cost(67.9)(15.3)(9.7)(6.5)(44.3)(12.7)(7.7)(4.3)
Interest Cost(255.6)(51.5)(53.0)(27.1)(250.0)(50.3)(51.6)(26.8)
Actuarial (Loss)/Gain(190.0)(37.8)(54.5)(11.7)280.2 56.2 74.1 30.7 
Benefits Paid - Pension334.5 69.1 67.2 38.8 320.9 68.1 67.1 38.0 
Benefits Paid - Lump Sum28.5 0.1 12.9 1.3 24.0 — 7.6 0.1 
Benefits Paid - SERP18.8 0.4 0.1 0.4 19.4 0.3 0.2 0.4 
Employee Transfers(0.3)1.2 2.8 0.1 — 4.0 13.8 2.7 
Water Reclassified as Assets Held for Sale— — — — 142.5 — — — 
Water Reclassified from Assets Held for Sale(142.5)— — — — — — — 
Benefit Obligation as of End of Year$(5,020.2)$(1,016.7)$(1,037.7)$(526.2)$(4,745.7)$(982.9)$(1,003.5)$(521.5)
Change in Pension Plan Assets:      
Fair Value of Pension Plan Assets as of
  Beginning of Year		$5,514.0 $1,144.4 $1,378.2 $597.5 $5,775.0 $1,170.0 $1,411.6 $614.0 
Employer Contributions2.5 — — — 5.0 — — — 
Actual Return on Pension Plan Assets588.4 119.3 144.7 61.3 227.0 46.5 55.1 24.3 
Benefits Paid - Pension(334.5)(69.1)(67.2)(38.8)(320.9)(68.1)(67.1)(38.0)
Benefits Paid - Lump Sum(28.5)(0.1)(12.9)(1.3)(24.0)— (7.6)(0.1)
Employee Transfers— (1.2)(2.8)(0.1)— (4.0)(13.8)(2.7)
Water Reclassified as Assets Held for Sale— — — — (148.1)— — — 
Water Reclassified from Assets Held for Sale148.1 — — — — — — — 
Fair Value of Pension Plan Assets as of End of Year$5,890.0 $1,193.3 $1,440.0 $618.6 $5,514.0 $1,144.4 $1,378.2 $597.5 
Funded Status as of December 31st$869.8 $176.6 $402.3 $92.4 $768.3 $161.5 $374.7 $76.0 
 PBOP
 As of December 31,
 20252024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Change in Benefit Obligation:      
Benefit Obligation as of Beginning of Year$(587.4)$(109.1)$(171.4)$(65.9)$(676.0)$(120.6)$(188.3)$(72.0)
Service Cost(6.4)(1.1)(1.1)(0.5)(7.0)(1.2)(1.2)(0.6)
Interest Cost(32.0)(5.6)(8.7)(3.4)(31.9)(5.6)(8.8)(3.4)
Actuarial (Loss)/Gain(11.3)(1.6)(3.5)(1.2)41.3 8.9 10.7 3.9 
Benefits Paid51.7 9.3 16.0 6.0 51.7 9.4 15.9 6.2 
Employee Transfers— 0.1 — 0.2 — — 0.3 — 
Water Reclassified as Assets Held for Sale— — — — 34.5 — — — 
Water Reclassified from Assets Held for Sale(34.5)— — — — — — — 
Benefit Obligation as of End of Year$(619.9)$(108.0)$(168.7)$(64.8)$(587.4)$(109.1)$(171.4)$(65.9)
Change in Plan Assets:      
Fair Value of Plan Assets as of Beginning of Year$1,036.3 $124.4 $519.2 $76.4 $1,024.4 $123.0 $490.4 $74.7 
Actual Return on Plan Assets131.9 14.9 65.0 9.3 92.3 11.2 45.8 7.6 
Employer Contributions0.7 — — — 0.9 — — — 
Benefits Paid(51.3)(9.3)(16.0)(5.9)(51.8)(9.4)(15.9)(6.1)
Employee Transfers— (0.3)0.6 (0.2)— (0.4)(1.1)0.2 
Water Reclassified as Assets Held for Sale— — — — (29.5)— — — 
Water Reclassified from Assets Held for Sale29.5 — — — — — — — 
Fair Value of Plan Assets as of End of Year$1,147.1 $129.7 $568.8 $79.6 $1,036.3 $124.4 $519.2 $76.4 
Funded Status as of December 31st$527.2 $21.7 $400.1 $14.8 $448.9 $15.3 $347.8 $10.5 
Schedule of Defined Benefit Plans
As of December 31, 2025 and 2024, the accumulated benefit obligation for the Pension and SERP Plans is as follows:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
2025$4,856.5 $981.5 $992.2 $513.1 
20244,617.1 953.9 969.5 507.4 
A reconciliation of the prepaid assets and liabilities within the Eversource Pension, SERP and PBOP Plans’ funded status to the balance sheets is as follows:
As of December 31,
 20252024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Prepaid Pension (1)
$982.0 $182.4 $404.0 $97.0 $887.7 $167.2 $376.9 $80.5 
Prepaid PBOP529.2 21.7 400.1 14.8 448.9 15.3 347.8 10.5 
Prepaid Pension and PBOP$1,511.2 $204.1 $804.1 $111.8 $1,336.6 $182.5 $724.7 $91.0 
Accrued SERP (1)
$(112.2)$(5.8)$(1.7)$(4.6)$(119.4)$(5.7)$(2.2)$(4.5)
Accrued PBOP (1)
(2.0)— — — — — — — 
Less: Accrued SERP - current portion13.3 0.3 — 0.4 24.0 0.4 0.2 0.4 
Accrued SERP and PBOP$(100.9)$(5.5)$(1.7)$(4.2)$(95.4)$(5.3)$(2.0)$(4.1)

(1)     As of December 31, 2024, the Aquarion water distribution business’s prepaid pension was reclassified to Assets Held for Sale and the accrued SERP and PBOP liabilities were reclassified to Liabilities Held for Sale on the Eversource balance sheet. As of December 31, 2025, these balances were reclassified to Prepaid Pension and Accrued SERP and PBOP on the Eversource balance sheet. For further information, see Note 24, “Assets Held for Sale.”
Schedule of Assumptions Used
The following actuarial assumptions were used in calculating the Pension, SERP and PBOP Plans' year end funded status:
 Pension and SERPPBOP
 As of December 31,As of December 31,
 2025202420252024
Discount Rate4.9%—5.5%5.6%—5.7%5.4%—5.5%5.7%
Compensation/Progression Rate3.5%—4.0%3.5%—4.0%N/A
Cash Balance Interest Crediting Rate4.8%N/AN/A
The following actuarial assumptions were used to calculate Pension, SERP and PBOP expense amounts:
Pension and SERPPBOP
 For the Years Ended December 31,For the Years Ended December 31,
 202520242023202520242023
Discount Rate5.2%—5.8%4.7%—5.1%4.9%—5.3%5.4%—5.9%4.9%—5.2%5.1%—5.4%
Expected Long-Term Rate of Return8.25%8.25%8.25%8.25%8.25%8.25%
Compensation/Progression Rate3.5%—4.0%3.5%—4.0%3.5%—4.0%N/AN/AN/A
Schedule of Net Benefit Costs
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 plan 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 SERPPBOP
 For the Year Ended December 31, 2025For the Year Ended December 31, 2025
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH EversourceCL&PNSTAR ElectricPSNH
Service Cost$67.9 $15.3 $9.7 $6.5 $6.4 $1.1 $1.1 $0.5 
Interest Cost255.6 51.5 53.0 27.1 32.0 5.6 8.7 3.4 
Expected Return on Plan Assets(454.3)(91.8)(110.7)(47.8)(84.6)(9.6)(42.0)(5.7)
Actuarial Loss/(Gain)42.9 5.1 14.3 2.1 (0.9)— — — 
Prior Service Cost/(Credit)1.1 — 0.3 — (21.6)1.1 (17.0)0.4 
Settlement Loss3.3 — — — — — — — 
Total Net Periodic Benefit Plan Income$(83.5)$(19.9)$(33.4)$(12.1)$(68.7)$(1.8)$(49.2)$(1.4)
Intercompany Income AllocationsN/A$(1.4)$(0.5)$(0.1)N/A$(2.1)$(2.7)$(0.9)
 Pension and SERPPBOP
 For the Year Ended December 31, 2024For the Year Ended December 31, 2024
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH EversourceCL&PNSTAR ElectricPSNH
Service Cost$44.3 $12.7 $7.7 $4.3 $7.0 $1.2 $1.2 $0.6 
Interest Cost250.0 50.3 51.6 26.8 31.9 5.6 8.8 3.4 
Expected Return on Plan Assets(462.6)(93.5)(112.4)(48.9)(81.2)(9.5)(39.5)(5.6)
Actuarial Loss/(Gain)85.9 12.1 25.6 5.0 (0.4)— — — 
Prior Service Cost/(Credit)1.3 — 0.3 — (21.6)1.1 (17.0)0.4 
Settlement Loss4.3 — — — — — — — 
Total Net Periodic Benefit Plan Income$(76.8)$(18.4)$(27.2)$(12.8)$(64.3)$(1.6)$(46.5)$(1.2)
Intercompany Income AllocationsN/A$(1.6)$(1.3)$(0.4)N/A$(2.2)$(2.6)$(0.9)
 Pension and SERPPBOP
 For the Year Ended December 31, 2023For the Year Ended December 31, 2023
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH EversourceCL&PNSTAR ElectricPSNH
Service Cost$43.1 $12.3 $7.8 $4.3 $7.6 $1.3 $1.2 $0.7 
Interest Cost254.0 50.5 53.9 27.3 33.8 6.2 9.2 3.7 
Expected Return on Plan Assets(465.0)(94.2)(113.8)(49.5)(77.1)(9.4)(36.9)(5.5)
Actuarial Loss45.8 2.5 17.1 1.5 — — — — 
Prior Service Cost/(Credit)1.3 — 0.3 — (21.6)1.1 (17.0)0.4 
Settlement Loss12.4 — — — — — — — 
Total Net Periodic Benefit Plan Income$(108.4)$(28.9)$(34.7)$(16.4)$(57.3)$(0.8)$(43.5)$(0.7)
Intercompany Income AllocationsN/A$(4.0)$(3.0)$(0.8)N/A$(1.9)$(2.1)$(0.7)
Schedule of Amounts Recognized in Regulatory Assets and OCI
The following is a summary of the changes in plan assets and benefit obligations recognized in Regulatory Assets and Other Comprehensive Income (OCI) as well as amounts in Regulatory Assets and OCI that were reclassified as net periodic benefit expense during the years presented:
Pension and SERPPBOP
 Regulatory AssetsOCIRegulatory AssetsOCI
 For the Years Ended December 31,For the Years Ended December 31,
(Millions of Dollars)20252024202520242025202420252024
Actuarial Loss/(Gain) Arising During the Year$57.0 $(49.2)$— $2.3 $(36.8)$(50.9)$— $(0.6)
Actuarial (Loss)/Gain Reclassified as Net Periodic Benefit (Expense)/Income(38.7)(79.1)(4.2)(6.8)0.9 0.4 — — 
Actuarial (Loss)/Gain Reclassified as Held for Sale— (16.6)— — — 7.1 — — 
Actuarial Loss/(Gain) Reclassified from Held for Sale16.6 — — — (7.1)— — — 
Settlement Loss— — (3.3)(4.3)— — — — 
Prior Service Cost Arising During the Year0.1 1.3 — — — — — — 
Prior Service (Cost)/Credit Reclassified as Net Periodic
  Benefit (Expense)/Income		(1.3)(1.2)0.2 (0.1)21.8 21.8 (0.2)(0.2)
Prior Service Cost Reclassified as Held for Sale— (1.2)— — — (0.6)— — 
Prior Service Cost Reclassified from Held for Sale1.2 — — — 0.6 — — — 
The following is a summary of the remaining Regulatory Assets and Accumulated Other Comprehensive Income amounts that have not been recognized as components of net periodic benefit expense as of December 31, 2025 and 2024:
Regulatory Assets as of December 31,AOCI as of December 31,
(Millions of Dollars)2025202420252024
Pension and SERP
Actuarial Loss$991.0 $956.1 $40.2 $47.7 
Prior Service Cost1.8 1.8 0.4 0.2 
PBOP
Actuarial (Gain)/Loss$(36.6)$6.4 $1.8 $1.8 
Prior Service (Credit)/Cost(43.8)(66.2)0.3 0.5 
Schedule of Expected Benefit Payments The following benefit payments, which reflect expected future service, are expected to be paid by the Pension, SERP and PBOP Plans:
(Millions of Dollars)202620272028202920302031 - 2035
Pension and SERP$375.4 $383.3 $387.3 $390.9 $394.0 $1,969.3 
PBOP53.0 52.3 51.5 50.6 49.6 232.1 
Schedule of Allocation of Plan Assets
These long-term rates of return are based on the assumed rates of return for the target asset allocations as follows:
 As of December 31,
20252024
 Target Asset AllocationAssumed Rate of ReturnTarget Asset AllocationAssumed Rate of Return
 
Eversource Pension Plan
Eversource PBOP Plan
Eversource Pension Plan and PBOP Plan
Eversource Pension Plan
Eversource PBOP Plan
Eversource Pension Plan and PBOP Plan
Equity Securities:  
United States— %20.0 %8.5 %— %20.0 %8.5 %
Global20.0 %— %8.8 %20.0 %— %8.8 %
Non-United States— %11.0 %8.5 %— %11.0 %8.5 %
Emerging Markets— %6.0 %10.0 %— %6.0 %10.0 %
Debt Securities:
Fixed Income16.0 %17.0 %5.5 %16.0 %17.0 %5.5 %
High Yield Fixed Income5.0 %— %7.5 %5.0 %— %7.5 %
United States Treasuries11.0 %— %4.5 %11.0 %— %4.5 %
Private Debt10.0 %13.0 %10.0 %10.0 %13.0 %10.0 %
Private Equity23.0 %18.0 %12.0 %23.0 %18.0 %12.0 %
Real Assets15.0 %15.0 %7.5 %15.0 %15.0 %7.5 %
The following tables present, by asset category, the Pension and PBOP Plan assets recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:  
  
Pension Plan
  
Fair Value Measurements as of December 31,
(Millions of Dollars)
2025 (1)
2024 (3)
Asset Category:Level 1Level 2UncategorizedTotalLevel 1Level 2UncategorizedTotal
Equity Securities302.8 110.9 816.2 1,229.9 323.6 — 826.0 1,149.6 
Fixed Income340.4 502.1 1,325.6 2,168.1 314.3 344.7 1,329.6 1,988.6 
Private Equity  — — 1,799.1 1,799.1 — — 1,710.9 1,710.9 
Real Assets158.3 127.5 638.9 924.7 243.8 — 652.2 896.0 
Total$801.5 $740.5 $4,579.8 $6,121.8 $881.7 $344.7 $4,518.7 $5,745.1 
Less:  401(h) PBOP Assets (3)
  (231.8)  (231.1)
Total Pension Assets  $5,890.0   $5,514.0 
  PBOP Plan
  
Fair Value Measurements as of December 31,
(Millions of Dollars)
2025 (2)
2024 (3)
Asset Category:Level 1Level 2UncategorizedTotalLevel 1Level 2UncategorizedTotal
Equity Securities132.7 48.3 214.4 395.4 184.8 — 166.3 351.1 
Fixed Income45.5 41.5 185.9 272.9 61.8 44.6 127.5 233.9 
Private Equity— — 120.1 120.1 — — 99.0 99.0 
Real Assets79.0 6.3 41.6 126.9 83.7 — 37.5 121.2 
Total$257.2 $96.1 $562.0 $915.3 $330.3 $44.6 $430.3 $805.2 
Add:  401(h) PBOP Assets (4)
  231.8   231.1 
Total PBOP Assets  $1,147.1   $1,036.3 

(1)     Fixed Income and Equity Securities classified as Level 2 as of December 31, 2025 include pending redemption settlements of $37.2 million and $15.4 million, respectively.

(2)     Equity Securities classified as Level 2 as of December 31, 2025 include pending redemption settlements of $46.8 million.

(3)     As of December 31, 2024, the funded status of the Aquarion water distribution business’s Pension and PBOP benefit plans were reclassified as held for sale presentation on the Eversource balance sheet. Therefore, these Pension and PBOP asset balances were excluded from the tables above as of December 31, 2024. As of December 31, 2025, the funded status of the Aquarion water distribution business’ Pension and PBOP benefit plans was no longer classified as held for sale in the Eversource balance sheet and the asset balances are included in the tables above. See Note 24, "Assets Held for Sale," for further information.

(4)     The assets of the Pension Plan include a 401(h) account that has been allocated to provide health and welfare postretirement benefits under the PBOP Plan.
Schedule of Defined Contribution Plans
The total Eversource 401k Plan employer matching contributions, including the K-Vantage contributions, were as follows:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
2025$68.6 $9.3 $15.7 $5.1 
202476.2 10.6 15.4 6.0 
202367.3 9.0 13.7 5.4 
Summary of Share Transactions A summary of RSU transactions is as follows:
RSUs
(Units)		Weighted Average
Grant-Date Fair Value
Outstanding as of December 31, 2024715,442 $61.95 
Granted345,870 $57.63 
Shares Issued(306,679)$65.99 
Forfeited(23,452)$63.23 
Outstanding as of December 31, 2025731,181 $58.17 
A summary of performance share transactions is as follows:
Performance Shares
(Units)		Weighted Average
Grant-Date Fair Value
Outstanding as of December 31, 2024864,192 $71.48 
Granted409,471 $57.82 
Shares Issued(163,335)$88.50 
Forfeited(91,885)$83.96 
Outstanding as of December 31, 20251,018,443 $62.13 
Schedule of Compensation Expense and Income Tax Benefit The total compensation expense and associated future income tax benefits recognized by Eversource, CL&P, NSTAR Electric and PSNH for share-based compensation awards were as follows:
EversourceFor the Years Ended December 31,
(Millions of Dollars)202520242023
Compensation Expense$33.6 $30.0 $27.8 
Future Income Tax Benefit8.8 7.8 7.3 
 For the Years Ended December 31,
 202520242023
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Compensation Expense$10.5 $11.6 $4.3 $9.3 $9.6 $3.6 $8.7 $8.7 $3.0 
Future Income Tax Benefit2.7 3.0 1.1 2.4 2.5 0.9 2.3 2.3 0.8 
Schedule of Other Retirement Benefits The liability and expense amounts are as follows:
Eversource
(Millions of Dollars)
As of and For the Years Ended December 31,
202520242023
Actuarially-Determined Liability$29.9 $30.2 $32.6 
Other Retirement Benefits Expense 2.3 2.4 2.6 
As of and For the Years Ended December 31,
 202520242023
(Millions of Dollars)CL&PNSTAR ElectricPSNHCL&PNSTAR ElectricPSNHCL&PNSTAR ElectricPSNH
Actuarially-Determined Liability$0.1 $— $1.0 0.1$— $1.0 $0.2 $— $1.1 
Other Retirement Benefits Expense 0.8 0.8 0.3 0.8 0.8 0.3 0.8 0.8 0.4