v3.25.2
PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION
 6 Months Ended
Jun. 30, 2025
Postemployment Benefits [Abstract]  
PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION
Eversource provides defined benefit retirement plans (Pension Plans) that cover eligible employees.  In addition to the Pension Plans, Eversource maintains non-qualified defined benefit retirement plans (SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible participants consisting of current and retired employees. Eversource also provides defined benefit postretirement plans (PBOP Plans) that provide life insurance and a health reimbursement arrangement created for the purpose of reimbursing retirees and dependents for health insurance premiums and certain medical expenses to eligible employees that meet certain age and service eligibility requirements.

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 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.

In August 2024, Eversource communicated to its employees participating in the Eversource 401k Plan enhanced defined contribution feature (referred to as K-Vantage) that effective January 1, 2025, a Cash Balance Pension Plan is established, which replaces employer K-Vantage contributions. Eversource transferred into the Cash Balance Pension Plan employees who are participants in the K-Vantage plan, with the exception of one union group that voted to enter effective January 1, 2026, and will credit employees a set percentage of an employee’s eligible pay based on age and years of service on the employee’s behalf. This benefit is a new, additional obligation of the existing Pension Plan and will be funded through the existing assets of the Eversource Pension Plan. The liability began accruing benefits upon the effective date of January 1, 2025.

 Pension and SERPPBOP
 For the Three Months Ended June 30, 2025For the Three Months Ended June 30, 2025
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Service Cost$17.2 $3.8 $2.4 $1.6 $1.6 $0.3 $0.3 $0.1 
Interest Cost64.1 12.9 13.4 6.8 8.0 1.4 2.2 0.8 
Expected Return on Plan Assets(113.7)(23.0)(27.7)(12.0)(21.1)(2.4)(10.5)(1.4)
Actuarial Loss/(Gain)11.0 1.3 3.7 0.5 (0.2)— — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.3 (4.3)0.1 
Total Net Periodic Benefit Plan Income$(21.1)$(5.0)$(8.1)$(3.1)$(17.1)$(0.4)$(12.3)$(0.4)
Intercompany Income AllocationsN/A$(0.5)$(0.3)$(0.1)N/A$(0.5)$(0.7)$(0.2)
Pension and SERPPBOP
For the Six Months Ended June 30, 2025For the Six Months Ended June 30, 2025
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$33.6 $7.6 $4.9 $3.2 $3.2 $0.5 $0.5 $0.2 
Interest Cost127.3 25.7 26.4 13.6 16.0 2.8 4.4 1.6 
Expected Return on Plan Assets(227.0)(45.9)(55.4)(23.9)(42.3)(4.8)(21.0)(2.8)
Actuarial Loss/(Gain)21.0 2.5 6.9 1.0 (0.5)— — — 
Prior Service Cost/(Credit)0.6 — 0.2 — (10.8)0.6 (8.5)0.2 
Settlement Loss3.3 — — — — — — — 
Total Net Periodic Benefit Plan Income$(41.2)$(10.1)$(17.0)$(6.1)$(34.4)$(0.9)$(24.6)$(0.8)
Intercompany (Income)/Expense AllocationsN/A$(0.4)$— $— N/A$(1.0)$(1.4)$(0.4)
Pension and SERPPBOP
For the Three Months Ended June 30, 2024For the Three Months Ended June 30, 2024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$11.2 $3.3 $1.9 $1.1 $1.8 $0.3 $0.3 $0.2 
Interest Cost62.7 12.7 12.8 6.7 8.0 1.4 2.2 0.8 
Expected Return on Plan Assets(115.7)(23.5)(28.0)(12.2)(20.3)(2.3)(9.9)(1.4)
Actuarial Loss/(Gain)22.1 3.2 6.4 1.3 (0.1)— — — 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.4)0.2 (4.3)0.1 
Total Net Periodic Benefit Plan Income$(19.4)$(4.3)$(6.8)$(3.1)$(16.0)$(0.4)$(11.7)$(0.3)
Intercompany Income AllocationsN/A$(0.6)$(0.6)$(0.2)N/A$(0.5)$(0.6)$(0.2)
Pension and SERPPBOP
For the Six Months Ended June 30, 2024For the Six Months Ended June 30, 2024
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$22.0 $6.2 $4.0 $2.1 $3.5 $0.6 $0.6 $0.3 
Interest Cost124.7 25.1 25.9 13.4 16.0 2.8 4.4 1.7 
Expected Return on Plan Assets(231.3)(46.8)(56.3)(24.4)(40.7)(4.7)(19.8)(2.8)
Actuarial Loss/(Gain)41.9 5.7 12.8 2.4 (0.2)— — — 
Prior Service Cost/(Credit)0.6 — 0.2 — (10.8)0.5 (8.5)0.2 
Settlement Loss4.3 — — — — — — — 
Total Net Periodic Benefit Plan Income$(37.8)$(9.8)$(13.4)$(6.5)$(32.2)$(0.8)$(23.3)$(0.6)
Intercompany Income AllocationsN/A$(0.3)$(0.2)$(0.1)N/A$(1.1)$(1.3)$(0.4)