CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Income	$ 368,023	$ 336,633
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	407	229
Changes in Unrealized (Losses)/Gains on Marketable Securities	(736)	160
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	1,517	1,559
Net OCI	1,188	1,948
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)
Comprehensive Income Attributable to Common Shareholders	367,331	336,701
The Connecticut Light and Power Company
Net Income	98,398	118,738
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)	(7)
Changes in Unrealized (Losses)/Gains on Marketable Securities	(25)	6
Net OCI	(32)	(1)
Comprehensive Income Attributable to Common Shareholders	98,366	118,737
NSTAR Electric Company
Net Income	93,924	100,390
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	109	109
Changes in Unrealized (Losses)/Gains on Marketable Securities	(7)	1
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	(41)	(43)
Net OCI	61	67
Comprehensive Income Attributable to Common Shareholders	93,985	100,457
Public Service Company of New Hampshire
Net Income	44,676	39,601
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	298	269
Changes in Unrealized (Losses)/Gains on Marketable Securities	(43)	9
Net OCI	255	278
Comprehensive Income Attributable to Common Shareholders	$ 44,931	$ 39,879