Presentation (Tables)

9 Months Ended

Sep. 30, 2012

Notes To Consolidated Financial Statements [Abstract]

ScheduleOfReclassificationAdjustments

	Transmission Expense				Energy Efficiency Expense
	Three Months Ended		Nine Months Ended		Three Months Ended		Nine Months Ended
(Millions of Dollars)	September 30, 2011		September 30, 2011		September 30, 2011		September 30, 2011
NU	$	6.3	$	71.1	$	35.3	$	99.7
CL&P		8.7		48.5		24.9		69.6
PSNH		(0.3)		12.7		3.7		9.6
WMECO		2.1		12.4		6.1		16.5