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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables) | 9 Months Ended
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Sep. 30, 2023
Postemployment Benefits [Abstract] |
Components of Net Periodic Benefit Expense/(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 September 30, 2023 |  | For the Three Months Ended September 30, 2023
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 10.7 |  |  | $ | 3.1 |  |  | $ | 1.9 |  |  | $ | 1.0 |  |  | $ | 1.9 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Interest Cost | 63.4 |  |  | 12.6 |  |  | 13.5 |  |  | 6.8 |  |  | 8.5 |  |  | 1.5 |  |  | 2.3 |  |  | 0.9 |
Expected Return on Plan Assets | (116.3) |  |  | (23.5) |  |  | (28.4) |  |  | (12.3) |  |  | (19.3) |  |  | (2.3) |  |  | (9.2) |  |  | (1.4) |
Actuarial Loss | 10.9 |  |  | 0.5 |  |  | 4.0 |  |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | (5.4) |  |  | 0.2 |  |  | (4.2) |  |  | 0.1 |
Settlement Loss | 8.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit Plan Income | $ | (22.3) |  |  | $ | (7.3) |  |  | $ | (8.9) |  |  | $ | (4.1) |  |  | $ | (14.3) |  |  | $ | (0.2) |  |  | $ | (10.8) |  |  | $ | (0.2) |
Intercompany Expense/(Income) Allocations | N/A |  | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | 0.3 |  |  | N/A |  | $ | (0.5) |  |  | $ | (0.5) |  |  | $ | (0.2) |
| Pension and SERP |  | PBOP
| For the Nine Months Ended September 30, 2023 |  | For the Nine Months Ended September 30, 2023
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 32.4 |  |  | $ | 9.2 |  |  | $ | 5.9 |  |  | $ | 3.2 |  |  | $ | 5.7 |  |  | $ | 1.0 |  |  | $ | 0.9 |  |  | $ | 0.6 |
Interest Cost | 190.6 |  |  | 37.9 |  |  | 40.5 |  |  | 20.4 |  |  | 25.4 |  |  | 4.6 |  |  | 6.9 |  |  | 2.7 |
Expected Return on Plan Assets | (348.7) |  |  | (70.6) |  |  | (85.3) |  |  | (37.1) |  |  | (57.9) |  |  | (7.0) |  |  | (27.7) |  |  | (4.2) |
Actuarial Loss | 35.0 |  |  | 1.9 |  |  | 12.9 |  |  | 1.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 0.9 |  |  | — |  |  | 0.3 |  |  | — |  |  | (16.2) |  |  | 0.8 |  |  | (12.7) |  |  | 0.3 |
Settlement Loss | 12.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit Plan Income | $ | (77.4) |  |  | $ | (21.6) |  |  | $ | (25.7) |  |  | $ | (12.3) |  |  | $ | (43.0) |  |  | $ | (0.6) |  |  | $ | (32.6) |  |  | $ | (0.6) |
Intercompany Income Allocations | N/A |  | $ | (1.8) |  |  | $ | (1.2) |  |  | $ | (0.3) |  |  | N/A |  | $ | (1.4) |  |  | $ | (1.6) |  |  | $ | (0.5) |
| Pension and SERP |  | PBOP
| For the Three Months Ended September 30, 2022 |  | For the Three Months Ended September 30, 2022
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 17.5 |  |  | $ | 4.7 |  |  | $ | 3.4 |  |  | $ | 1.7 |  |  | $ | 2.9 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 0.3 |
Interest Cost | 38.6 |  |  | 7.8 |  |  | 8.2 |  |  | 4.2 |  |  | 5.0 |  |  | 0.9 |  |  | 1.3 |  |  | 0.5 |
Expected Return on Plan Assets | (130.7) |  |  | (26.5) |  |  | (32.1) |  |  | (14.0) |  |  | (22.5) |  |  | (2.8) |  |  | (10.6) |  |  | (1.7) |
Actuarial Loss | 28.4 |  |  | 4.0 |  |  | 8.1 |  |  | 1.9 |  |  | — |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 0.4 |  |  | — |  |  | 0.1 |  |  | — |  |  | (5.4) |  |  | 0.3 |  |  | (4.2) |  |  | 0.1 |
Total Net Periodic Benefit Plan Income | $ | (45.8) |  |  | $ | (10.0) |  |  | $ | (12.3) |  |  | $ | (6.2) |  |  | $ | (20.0) |  |  | $ | (1.1) |  |  | $ | (13.0) |  |  | $ | (0.8) |
Intercompany Income Allocations | N/A |  | $ | (4.0) |  |  | $ | (3.2) |  |  | $ | (1.0) |  |  | N/A |  | $ | (0.9) |  |  | $ | (0.9) |  |  | $ | (0.3) |
| Pension and SERP |  | PBOP
| For the Nine Months Ended September 30, 2022 |  | For the Nine Months Ended September 30, 2022
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 52.7 |  |  | $ | 13.9 |  |  | $ | 10.4 |  |  | $ | 5.2 |  |  | $ | 8.7 |  |  | $ | 1.5 |  |  | $ | 1.5 |  |  | $ | 0.8 |
Interest Cost | 115.8 |  |  | 23.4 |  |  | 24.5 |  |  | 12.6 |  |  | 15.1 |  |  | 2.7 |  |  | 3.9 |  |  | 1.6 |
Expected Return on Plan Assets | (393.1) |  |  | (79.6) |  |  | (96.2) |  |  | (42.1) |  |  | (67.5) |  |  | (8.4) |  |  | (31.8) |  |  | (5.0) |
Actuarial Loss | 87.5 |  |  | 12.2 |  |  | 24.7 |  |  | 6.0 |  |  | — |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 1.1 |  |  | — |  |  | 0.3 |  |  | — |  |  | (16.2) |  |  | 0.8 |  |  | (12.7) |  |  | 0.3 |
Total Net Periodic Benefit Plan Income | $ | (136.0) |  |  | $ | (30.1) |  |  | $ | (36.3) |  |  | $ | (18.3) |  |  | $ | (59.9) |  |  | $ | (3.4) |  |  | $ | (39.1) |  |  | $ | (2.3) |
Intercompany Income Allocations | N/A |  | $ | (11.9) |  |  | $ | (9.3) |  |  | $ | (2.7) |  |  | N/A |  | $ | (2.7) |  |  | $ | (2.7) |  |  | $ | (0.9) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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