QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information

	Quarter Ended
Eversource (Millions of Dollars, except   per share information)	2018								2017
	March 31,		June 30,		September 30,		December 31,		March 31,		June 30,		September 30,		December 31,
Operating Revenues	$	2,288.0	$	1,853.9	$	2,271.4	$	2,034.9	$	2,105.1	$	1,762.8	$	1,988.5	$	1,895.6
Operating Income	442.5		391.4		466.0		400.0		501.0		448.2		495.3		443.7
Net Income	271.4		244.6		291.3		233.2		261.3		232.6		262.2		239.4
Net Income Attributable   to Common Shareholders	269.5		242.8		289.4		231.3		259.5		230.7		260.4		237.4
Basic and Diluted EPS (1)	$	0.85	$	0.76	$	0.91	$	0.73	$	0.82	$	0.73	$	0.82	$	0.75

(1)    The summation of quarterly EPS data may not equal annual data due to rounding.

	Quarter Ended
	2018								2017
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,		March 31,		June 30,		September 30,		December 31,
CL&P
Operating Revenues	$	785.0	$	694.9	$	865.0	$	751.3	$	732.3	$	666.6	$	774.8	$	713.7
Operating Income	157.2		163.1		172.7		142.8		175.5		175.6		177.1		155.2
Net Income	98.6		99.7		100.3		79.1		90.2		91.3		96.1		99.1
NSTAR Electric
Operating Revenues	$	770.1	$	690.7	$	939.5	$	712.6	$	733.8	$	704.7	$	851.9	$	690.2
Operating Income	119.0		133.6		205.5		126.0		156.6		177.9		229.7		124.2
Net Income	77.1		87.9		140.6		77.5		83.4		95.0		125.8		70.5
PSNH
Operating Revenues	$	267.4	$	235.1	$	290.2	$	254.9	$	253.2	$	230.4	$	250.0	$	248.0
Operating Income	55.8		46.9		56.5		37.2		66.6		63.5		66.0		69.8
Net Income	35.1		25.8		40.7		14.3		34.3		31.6		33.7		36.4