QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information

	Quarter Ended
Eversource (Millions of Dollars, except   per share information)	2016								2015
	March 31,		June 30,		September 30,		December 31,		March 31,		June 30,		September 30,		December 31,
Operating Revenues	$	2,055.6	$	1,767.2	$	2,039.7	$	1,776.6	$	2,513.4	$	1,817.1	$	1,933.1	$	1,691.2
Operating Income	488.5		423.4		509.9		438.1		497.5		412.0		469.2		385.5
Net Income	246.0		205.5		267.2		231.1		255.1		209.4		237.8		183.7
Net Income Attributable   to Common Shareholders	244.2		203.6		265.3		229.2		253.3		207.5		235.9		181.8
Basic EPS (1)	$	0.77	$	0.64	$	0.83	$	0.72	$	0.80	$	0.65	$	0.74	$	0.57
Diluted EPS (1)	$	0.77	$	0.64	$	0.83	$	0.72	$	0.80	$	0.65	$	0.74	$	0.57

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

	Quarter Ended
	2016								2015
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,		March 31,		June 30,		September 30,		December 31,
CL&P
Operating Revenues	$	735.3	$	679.8	$	760.0	$	630.9	$	804.9	$	666.6	$	704.3	$	626.9
Operating Income	171.5		162.1		176.1		163.5		141.8		154.0		161.1		154.2
Net Income	87.0		82.9		86.6		77.8		69.2		78.8		80.2		71.2
NSTAR Electric
Operating Revenues	$	614.2	$	591.3	$	780.5	$	571.9	$	766.8	$	617.2	$	750.7	$	546.6
Operating Income	109.8		130.5		208.7		104.8		159.5		151.4		214.2		117.7
Net Income	54.5		68.2		117.2		52.8		83.6		82.0		118.6		60.3
PSNH
Operating Revenues	$	242.3	$	218.5	$	266.9	$	231.8	$	284.8	$	241.9	$	234.4	$	211.1
Operating Income	70.7		63.1		74.7		54.6		63.2		54.1		63.6		49.3
Net Income	36.1		31.3		38.5		26.1		32.0		27.9		32.5		22.0
WMECO
Operating Revenues	$	128.1	$	116.4	$	124.0	$	115.7	$	152.9	$	125.2	$	125.1	$	114.9
Operating Income	33.1		29.2		32.1		26.0		28.6		28.9		30.0		28.0
Net Income	16.8		13.3		16.0		12.0		13.2		14.2		15.0		14.1