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COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Noncontrolling Interest [Line Items] |  |  |
Dividends on preferred stock | $ 7,519 | $ 7,519 | $ 7,519
Noncontrolling interest - preferred stock of subsidiaries | 155,568 | 155,569 |
CL&P and NSTAR Electric |  |  |
Noncontrolling Interest [Line Items] |  |  |
Dividends on preferred stock | $ 7,500 | $ 7,500 | $ 7,500

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