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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Not Subject to Mandatory Redemption | $ | 155.6 |  |  | $ | 124.8 |  |  | $ | 116.2 |  |  | $ | 92.0 |  |  | $ | 43.0 |  |  | $ | 32.8 |  |  | $ | — |  |  | $ | — |
Long-Term Debt | 27,599.0 |  |  | 26,038.9 |  |  | 5,508.1 |  |  | 5,168.9 |  |  | 5,887.2 |  |  | 5,617.4 |  |  | 1,732.4 |  |  | 1,551.6 |
Rate Reduction Bonds | 345.7 |  |  | 336.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 345.7 |  |  | 336.7 |
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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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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