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SHORT-TERM AND LONG-TERM DEBT (Tables)
 3 Months Ended
Mar. 31, 2026
Debt Disclosure [Abstract]  
Schedule of Borrowings Outstanding
The amount of borrowings outstanding and available under the commercial paper programs were as follows:
Borrowings Outstanding as ofAvailable Borrowing Capacity as ofWeighted-Average Interest Rate as of
March 31, 2026December 31, 2025March 31, 2026December 31, 2025March 31, 2026December 31, 2025
(Millions of Dollars)
Eversource Parent Commercial Paper Program $533.0 $1,280.0 $1,467.0 $720.0 4.08 %3.98 %
NSTAR Electric Commercial Paper Program — 245.4 650.0 404.6 — %3.87 %
Schedule of Long-Term Debt Issuance and Repayments The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars)Interest RateIssuance/(Repayment)Issue Date or Repayment DateMaturity DateUse of Proceeds for Issuance/
Repayment Information
Eversource Parent Series A Junior Notes (1)
6.10 %$750.0 February 2026August 2056Repay Series AA Senior Notes at maturity, repay Series U Senior Notes at maturity, repaid short-term debt, and for general corporate purposes
Eversource Parent Series B Junior Notes (2)
6.35 %$750.0 February 2026August 2056Repay Series AA Senior Notes at maturity, repay Series U Senior Notes at maturity, repaid short-term debt, and for general corporate purposes
Eversource Parent Series J Senior Notes3.35 %$(250.0)March 2026March 2026Paid at maturity

(1)    The Eversource Parent Series A Junior Subordinated Notes bear interest at a fixed rate of 6.10 percent per year from August 15, 2026 to August 14, 2031. Thereafter, the interest rate resets every five years, commencing on August 15, 2031, at a rate per year equal to the five-year U.S. Treasury Rate plus a spread of 2.521 percent.

(2)     The Eversource Parent Series B Junior Subordinated Notes bear interest at a fixed rate of 6.35 percent per year from August 15, 2026 to August 14, 2036. Thereafter, the interest rate resets every five years, commencing on August 15, 2036, at a rate per year equal to the five-year U.S. Treasury Rate plus a spread of 2.325 percent.