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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | A reconciliation of the beginning and ending carrying amounts of ARO liabilities is as follows:
| As of December 31,
| 2024 |  | 2023
(Millions of Dollars) | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH |  | Eversource |  | CL&P |  | NSTAR Electric |  | PSNH
Balance as of Beginning of Year | $ | 505.8 |  |  | $ | 39.9 |  |  | $ | 104.8 |  |  | $ | 5.2 |  |  | $ | 502.7 |  |  | $ | 37.4 |  |  | $ | 101.3 |  |  | $ | 4.9 |
Liabilities Settled During the Year | (24.6) |  |  | — |  |  | — |  |  | — |  |  | (24.9) |  |  | — |  |  | — |  |  | — |
Accretion | 29.5 |  |  | 2.6 |  |  | 4.5 |  |  | 0.4 |  |  | 29.2 |  |  | 2.5 |  |  | 4.3 |  |  | 0.3 |
Revisions in Estimated Cash Flows | 80.2 |  |  | — |  |  | — |  |  | — |  |  | (1.2) |  |  | — |  |  | (0.8) |  |  | — |
Balance as of End of Year | $ | 590.9 |  |  | $ | 42.5 |  |  | $ | 109.3 |  |  | $ | 5.6 |  |  | $ | 505.8 |  |  | $ | 39.9 |  |  | $ | 104.8 |  |  | $ | 5.2 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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