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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION | 3 Months Ended
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Mar. 31, 2023
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 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 SERP |  | PBOP
| For the Three Months Ended March 31, 2023 |  | For the Three Months Ended March 31, 2023
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 11.0 |  |  | $ | 3.0 |  |  | $ | 2.1 |  |  | $ | 1.1 |  |  | $ | 1.8 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Interest Cost | 63.7 |  |  | 12.6 |  |  | 13.5 |  |  | 6.8 |  |  | 8.5 |  |  | 1.6 |  |  | 2.3 |  |  | 0.9 |
Expected Return on Plan Assets | (115.9) |  |  | (23.4) |  |  | (28.4) |  |  | (12.3) |  |  | (19.1) |  |  | (2.4) |  |  | (9.2) |  |  | (1.4) |
Actuarial Loss | 12.5 |  |  | 0.8 |  |  | 4.9 |  |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | (5.4) |  |  | 0.3 |  |  | (4.2) |  |  | 0.1 |
Total Net Periodic Benefit Plan Income | $ | (28.4) |  |  | $ | (7.0) |  |  | $ | (7.8) |  |  | $ | (4.0) |  |  | $ | (14.2) |  |  | $ | (0.2) |  |  | $ | (10.8) |  |  | $ | (0.2) |
Intercompany Income Allocations | N/A |  | $ | (2.0) |  |  | $ | (1.7) |  |  | $ | (0.5) |  |  | N/A |  | $ | (0.5) |  |  | $ | (0.6) |  |  | $ | (0.2) |
| Pension and SERP |  | PBOP
| For the Three Months Ended March 31, 2022 |  | For the Three Months Ended March 31, 2022
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 17.7 |  |  | $ | 4.5 |  |  | $ | 3.6 |  |  | $ | 1.8 |  |  | $ | 2.8 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 0.2 |
Interest Cost | 38.6 |  |  | 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 Loss | 30.7 |  |  | 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 Allocations | N/A |  | $ | (3.8) |  |  | $ | (2.9) |  |  | $ | (0.8) |  |  | N/A |  | $ | (0.9) |  |  | $ | (0.9) |  |  | $ | (0.3) |

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