NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Comprehensive Income/(Loss), Net of Tax:
Comprehensive Income/(Loss) Attributable to Common Shareholders	$ 1,698,337	$ 818,918	$ (436,556)
NSTAR Electric Company
Net Income/(Loss)	630,623	636,353	544,528
Other Comprehensive Income/(Loss), Net of Tax:
Changes in Funded Status of SERP Benefit Plan	346	(205)	(272)
Qualified Cash Flow Hedging Instruments	20	20	20
Changes in Unrealized Gains on Marketable Securities	0	0	12
Other Comprehensive Income/(Loss), Net of Tax	366	(185)	(240)
Comprehensive Income/(Loss) Attributable to Common Shareholders	$ 630,989	$ 636,168	$ 544,288