CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income	$ 310,558	$ 271,426
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	316
Qualified Cash Flow Hedging Instruments		724
Changes in Unrealized Gains/(Losses) on Marketable Securities	655	(444)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	1,225	2,993
Other Comprehensive Income, Net of Tax	2,196	3,273
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)
Comprehensive Income Attributable to Common Shareholders	310,874	272,819
The Connecticut Light and Power Company
Net Income	110,471	98,568
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	(6)
Qualified Cash Flow Hedging Instruments		52
Changes in Unrealized Gains/(Losses) on Marketable Securities	23	(12)
Other Comprehensive Income, Net of Tax	17	40
Comprehensive Income Attributable to Common Shareholders	110,488	98,608
NSTAR Electric Company
Net Income	94,014	77,149
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	110
Qualified Cash Flow Hedging Instruments		109
Changes in Unrealized Gains/(Losses) on Marketable Securities	6	(4)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	1	1
Other Comprehensive Income, Net of Tax	117	106
Comprehensive Income Attributable to Common Shareholders	94,131	77,255
Public Service Company of New Hampshire
Net Income	32,781	35,093
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	269
Qualified Cash Flow Hedging Instruments		290
Changes in Unrealized Gains/(Losses) on Marketable Securities	38	(21)
Other Comprehensive Income, Net of Tax	307	269
Comprehensive Income Attributable to Common Shareholders	$ 33,088	$ 35,362