QUARTERLY FINANCIAL DATA (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

NU Consolidated Statements of Quarterly Financial Data	Quarter Ended (a)
(Millions of Dollars, except per share information)	March 31,		June 30,		September 30,		December 31,
2012 (1)
Operating Revenues	$	1,099.6	$	1,628.7	$	1,861.5	$	1,684.0
Operating Income		214.4		159.5		412.9		331.4
Net Income		100.8		46.2		209.5		176.6	(2)
Net Income Attributable to Controlling Interest		99.3		44.3		207.6		174.7
Basic and Diluted EPS	$	0.56	$	0.15	$	0.66	$	0.55
2011 (1)
Operating Revenues	$	1,235.3	$	1,047.5	$	1,114.9	$	1,068.0
Operating Income		227.4		178.1		203.8		184.9
Net Income		115.6		78.7		91.4		114.8
Net Income Attributable to Controlling Interest		114.2		77.3		90.0		113.2
Basic and Diluted EPS	$	0.64	$	0.44	$	0.51	$	0.64
(a) The summation of quarterly EPS data may not equal annual data due to rounding.
CL&P Consolidated Statements of Quarterly Financial Data	Quarter Ended
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,
2012
Operating Revenues	$	592.0	$	562.1	$	658.1	$	595.2
Operating Income		111.9		40.4		139.7		135.0
Net Income		54.0		6.9		74.9		73.9
2011
Operating Revenues	$	673.7	$	608.0	$	673.7	$	593.0
Operating Income		126.0		114.8		137.7		84.7
Net Income		64.3		52.6		66.5		66.8
NSTAR Electric Consolidated Statements of
Quarterly Financial Data	Quarter Ended
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,
2012 (1)
Operating Revenues	$	556.5	$	534.6	$	693.7	$	516.2
Operating Income		22.5		93.9		194.1		70.9
Net Income		3.9		45.5		106.8		34.0	(2)
2011 (1)
Operating Revenues	$	577.5	$	552.3	$	724.7	$	548.6
Operating Income		87.7		115.6		183.7		99.2
Net Income		42.9		60.7		99.8		49.1
PSNH Consolidated Statements of Quarterly Financial Data	Quarter Ended
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,
2012
Operating Revenues	$	243.0	$	255.1	$	256.9	$	233.0
Operating Income		45.4		47.0		61.3		51.4
Net Income		21.3		21.2		27.2		27.2
2011
Operating Revenues	$	269.5	$	240.2	$	259.6	$	243.7
Operating Income		46.9		37.9		48.5		46.8
Net Income		27.5		21.7		25.6		25.5
WMECO Consolidated Statements of Quarterly Financial Data	Quarter Ended
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,
2012
Operating Revenues	$	114.0	$	106.8	$	112.5	$	107.9
Operating Income		28.7		25.1		28.1		28.9
Net Income		14.2		11.1		14.1		15.1
2011
Operating Revenues	$	106.7	$	98.4	$	104.5	$	107.7
Operating Income		21.1		18.5		19.8		29.0
Net Income		10.0		8.2		8.4		16.5