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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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