DERIVATIVE INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the fair values of derivative contracts, categorized by risk type, which are recorded as current or long-term derivative assets or liabilities:


NSTAR Electric (Millions of Dollars)	Fair Value Hierarchy	Commodity Supply and Price Risk Management
		As of June 30, 2026		As of December 31, 2025

Current Derivative Assets	Level 3	$	115.1		$	91.0


Long-Term Derivative Liabilities	Level 3	(390.3)			(753.1)

Schedule of Derivative Assets and Derivative Liabilities Measured at Fair Value

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 in the following table.


NSTAR Electric (Millions of Dollars)	For the Three Months Ended		For the Six Months Ended
	June 30, 2026		June 30, 2026
Derivatives, Net:
Fair Value as of Beginning of Period	$	(505.0)	$	(662.1)
Net Realized/Unrealized Gains Included in Regulatory Assets and Liabilities	218.3		438.8
Settlements	11.5		(51.9)
Fair Value as of End of Period	$	(275.2)	$	(275.2)