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COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Noncontrolling Interest [Line Items] |  |  |
Net income attributable to noncontrolling interests | $ 1,412,394 | $ 1,228,046 | $ 1,212,686
Noncontrolling interest - preferred stock of subsidiaries | 155,570 | 155,570 |
CL&P and NSTAR Electric |  |  |
Noncontrolling Interest [Line Items] |  |  |
Net income attributable to noncontrolling interests | $ 7,500 | $ 7,500 | $ 7,500

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