CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income	$ 244,647	$ 232,629	$ 516,072	$ 493,966
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	471	514	1,195	1,048
Changes in Unrealized (Losses)/Gains on Marketable Securities	(144)	960	(588)	2,605
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	1,815	(2,268)	4,808	(1,306)
Net OCI	2,142	(794)	5,415	2,347
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)	(3,759)	(3,759)
Comprehensive Income Attributable to Common Shareholders	244,909	229,955	517,728	492,554
The Connecticut Light and Power Company
Net Income	99,712	91,293	198,280	181,501
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	13	91	65	202
Changes in Unrealized (Losses)/Gains on Marketable Securities	(4)	33	(16)	89
Net OCI	9	124	49	291
Comprehensive Income Attributable to Common Shareholders	99,721	91,417	198,329	181,792
NSTAR Electric Company
Net Income	87,921	94,983	165,071	178,364
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	109	110	218	219
Changes in Unrealized (Losses)/Gains on Marketable Securities	(1)	9	(5)	25
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	1	(4)	2	(8)
Net OCI	109	115	215	236
Comprehensive Income Attributable to Common Shareholders	88,030	95,098	165,286	178,600
Public Service Company of New Hampshire
Net Income	25,779	31,591	60,871	65,903
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	277	290	567	581
Changes in Unrealized (Losses)/Gains on Marketable Securities	(8)	58	(29)	155
Net OCI	269	348	538	736
Comprehensive Income Attributable to Common Shareholders	$ 26,048	$ 31,939	$ 61,409	$ 66,639