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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)
3 Months Ended
Mar. 31, 2022
Postemployment Benefits [Abstract]  
Components of Net Periodic Benefit Expense/(Income)
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)