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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities:
 As of December 31,
 20252024

(Millions of Dollars)
Fair Value HierarchyCommodity Supply
and Price Risk
Management
Netting (1)
Net Amount
Recorded as
a Derivative		Commodity Supply
and Price Risk
Management
Netting (1)
Net Amount
Recorded as
a Derivative
Current Derivative Assets:
CL&PLevel 2$— $— $— $14.2 $(0.3)$13.9 
NSTAR ElectricLevel 391.0 — 91.0 — — — 
Current Derivative Liabilities:
CL&PLevel 2(0.1)— (0.1)(71.1)— (71.1)
Long-Term Derivative Liabilities:
NSTAR ElectricLevel 3(753.1)— (753.1)— — — 

(1)     Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets.  These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation
The following table presents changes in the Level 3 category of derivative assets and derivative liabilities measured at fair value on a recurring basis.  The derivative assets and liabilities are presented on a net basis.
NSTAR Electric
(Millions of Dollars)
For the Year Ended
December 31, 2025
Derivatives, Net:
Fair Value as of Beginning of Year$— 
Net Realized/Unrealized Losses Included in Regulatory Assets or Regulatory Liabilities(662.1)
Settlements— 
Fair Value as of End of Year$(662.1)