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v3.25.2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Carrying Amounts and Estimated Fair Values of Financial Instruments | Carrying amounts and estimated fair values are as follows:
| Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
(Millions of Dollars) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
As of June 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 121.4 |  |  | $ | 116.2 |  |  | $ | 89.8 |  |  | $ | 43.0 |  |  | $ | 31.6 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 28,163.3 |  |  | 26,766.3 |  |  | 5,508.5 |  |  | 5,191.9 |  |  | 5,888.1 |  |  | 5,637.1 |  |  | 2,031.1 |  |  | 1,861.7 |
Rate Reduction Bonds | 345.7 |  |  | 338.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 345.7 |  |  | 338.1 |
As of December 31, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 123.8 |  |  | $ | 116.2 |  |  | $ | 90.3 |  |  | $ | 43.0 |  |  | $ | 33.5 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 26,704.8 |  |  | 24,791.4 |  |  | 5,111.1 |  |  | 4,705.8 |  |  | 5,094.9 |  |  | 4,759.4 |  |  | 1,732.1 |  |  | 1,529.7 |
Rate Reduction Bonds | 367.3 |  |  | 352.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 367.3 |  |  | 352.1 |

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