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SHORT-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | $ 1,930,422 | $ 1,442,200
Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | 1,564,575 | 1,442,200
Commercial Paper | Eversource Parent Commercial Paper Program |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | 1,771,900 | 1,442,200
Available Borrowing Capacity as of December 31, | $ 228,100 | $ 557,800
Weighted-Average Interest Rate as of December 31, | 5.60% | 4.63%
Commercial Paper | NSTAR Electric |  |
Line of Credit Facility [Line Items] |  |
Borrowings Outstanding as of December 31, | $ 365,800 | $ 0
Available Borrowing Capacity as of December 31, | $ 284,200 | $ 650,000
Weighted-Average Interest Rate as of December 31, | 5.40% | 0.00%

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