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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables) | 3 Months Ended
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Mar. 31, 2025
Postemployment Benefits [Abstract] |
Components of Net Periodic Benefit Expense/(Income) | 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 with ongoing negotiations, 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 SERP |  | PBOP
| For the Three Months Ended March 31, 2025 |  | For the Three Months Ended March 31, 2025
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 16.4 |  |  | $ | 3.8 |  |  | $ | 2.5 |  |  | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.1 |
Interest Cost | 63.2 |  |  | 12.8 |  |  | 13.0 |  |  | 6.8 |  |  | 8.0 |  |  | 1.4 |  |  | 2.2 |  |  | 0.8 |
Expected Return on Plan Assets | (113.3) |  |  | (22.9) |  |  | (27.7) |  |  | (11.9) |  |  | (21.2) |  |  | (2.4) |  |  | (10.5) |  |  | (1.4) |
Actuarial Loss/(Gain) | 10.0 |  |  | 1.2 |  |  | 3.2 |  |  | 0.5 |  |  | (0.3) |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | (5.4) |  |  | 0.3 |  |  | (4.2) |  |  | 0.1 |
Settlement Loss | 3.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit Plan Income | $ | (20.1) |  |  | $ | (5.1) |  |  | $ | (8.9) |  |  | $ | (3.0) |  |  | $ | (17.3) |  |  | $ | (0.5) |  |  | $ | (12.3) |  |  | $ | (0.4) |
Intercompany Expense/(Income) Allocations | N/A |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.1 |  |  | N/A |  | $ | (0.5) |  |  | $ | (0.7) |  |  | $ | (0.2) |
| Pension and SERP |  | PBOP
| For the Three Months Ended March 31, 2024 |  | For the Three Months Ended March 31, 2024
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Service Cost | $ | 10.8 |  |  | $ | 2.9 |  |  | $ | 2.1 |  |  | $ | 1.0 |  |  | $ | 1.7 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.1 |
Interest Cost | 62.0 |  |  | 12.4 |  |  | 13.1 |  |  | 6.7 |  |  | 8.0 |  |  | 1.4 |  |  | 2.2 |  |  | 0.9 |
Expected Return on Plan Assets | (115.6) |  |  | (23.3) |  |  | (28.3) |  |  | (12.2) |  |  | (20.4) |  |  | (2.4) |  |  | (9.9) |  |  | (1.4) |
Actuarial Loss/(Gain) | 19.8 |  |  | 2.5 |  |  | 6.4 |  |  | 1.1 |  |  | (0.1) |  |  | — |  |  | — |  |  | — |
Prior Service Cost/(Credit) | 0.3 |  |  | — |  |  | 0.1 |  |  | — |  |  | (5.4) |  |  | 0.3 |  |  | (4.2) |  |  | 0.1 |
Settlement Loss | 4.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit Plan Income | $ | (18.4) |  |  | $ | (5.5) |  |  | $ | (6.6) |  |  | $ | (3.4) |  |  | $ | (16.2) |  |  | $ | (0.4) |  |  | $ | (11.6) |  |  | $ | (0.3) |
Intercompany Expense/(Income) Allocations | N/A |  | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | 0.1 |  |  | N/A |  | $ | (0.6) |  |  | $ | (0.7) |  |  | $ | (0.2) |

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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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