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SHORT-TERM AND LONG-TERM DEBT - Borrowings Outstanding and Available under the Commercial Paper Programs (Details) - Commercial Paper - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 1,381.6 | $ 1,538.0
Available borrowing capacity | $ 618.4 | $ 462.0
Weighted-average interest rate (in percent) | 4.78% | 4.76%
NSTAR Electric |  |
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 108.5 | $ 504.8
Available borrowing capacity | $ 541.5 | $ 145.2
Weighted-average interest rate (in percent) | 4.43% | 4.55%

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