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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION
 3 Months Ended
Mar. 31, 2022
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.

Pension and SERPPBOP
For the Three Months Ended March 31, 2022For the Three Months Ended March 31, 2022
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$17.7 $4.5 $3.6 $1.8 $2.8 $0.5 $0.5 $0.2 
Interest Cost38.6 7.8 8.1 4.2 5.0 0.9 1.3 0.5 
Expected Return on Plan Assets(131.7)(26.6)(32.0)(14.1)(22.4)(2.8)(10.6)(1.6)
Actuarial Losses, net30.7 4.2 8.5 2.2 — — — — 
Prior Service Cost/(Credit)0.4 — 0.1 — (5.4)0.2 (4.3)0.1 
Total Net Periodic Benefit Plan Income$(44.3)$(10.1)$(11.7)$(5.9)$(20.0)$(1.2)$(13.1)$(0.8)
Intercompany Income AllocationsN/A$(3.8)$(2.9)$(0.8)N/A$(0.9)$(0.9)$(0.3)
Pension and SERPPBOP
For the Three Months Ended March 31, 2021For the Three Months Ended March 31, 2021
(Millions of Dollars)EversourceCL&PNSTAR
Electric		PSNHEversourceCL&PNSTAR
Electric		PSNH
Service Cost$21.3 $6.3 $4.0 $2.2 $3.5 $0.6 $0.6 $0.3 
Interest Cost32.6 7.3 6.7 3.6 4.4 0.8 1.1 0.5 
Expected Return on Plan Assets(108.9)(21.6)(26.9)(11.9)(19.7)(2.6)(9.3)(1.5)
Actuarial Loss61.6 13.0 15.5 4.9 2.6 0.4 0.6 0.3 
Prior Service Cost/(Credit)0.3 — 0.1 — (5.3)0.2 (4.2)0.1 
Total Net Periodic Benefit Plan Expense/(Income)$6.9 $5.0 $(0.6)$(1.2)$(14.5)$(0.6)$(11.2)$(0.3)
Intercompany Expense/(Income) AllocationsN/A$1.3 $1.5 $0.5 N/A$(0.3)$(0.4)$(0.1)
Eversource Contributions: Based on the current status of the Pension Plans and federal pension funding requirements, there is no minimum funding requirement for our Pension Plans for 2022. Eversource currently expects to make contributions between $100 million to $175 million in 2022, most of which will be contributed by Eversource Service, however the planned contribution is discretionary and subject to change. Eversource currently estimates contributing $2.4 million to the PBOP Plans in 2022.