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SHORT-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | $ 2,042,793 | $ 1,930,422
Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | 1,538,011 | 1,564,575
Commercial Paper | Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | 1,538,000 | 1,771,900
Available Borrowing Capacity as of December 31, | $ 462,000 | $ 228,100
Weighted-Average Interest Rate as of December 31, | 4.76% | 5.60%
Commercial Paper | NSTAR Electric |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | $ 504,800 | $ 365,800
Available Borrowing Capacity as of December 31, | $ 145,200 | $ 284,200
Weighted-Average Interest Rate as of December 31, | 4.55% | 5.40%

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