Environmental Matters (Tables)

9 Months Ended

Sep. 30, 2012

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Environmental Loss Contingencies By Site Text Block

	As of September 30, 2012						As of December 31, 2011
			Reserve					Reserve
	Number of Sites		(in millions)		Number of Sites			(in millions)
NU		83	$	38.6		59		$	31.7
CL&P		18		3.2		18			2.9
NSTAR Electric (1)		14		1.4		13			1.3
PSNH		19		5.2		18			6.6
WMECO		10		0.4		10			0.3