Environmental Matters (Tables)

3 Months Ended

Mar. 31, 2012

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Environmental Loss Contingencies By Site Text Block

	As of March 31, 2012						As of December 31, 2011
					Portion Related to						Portion Related to
			Reserve		MGP Sites				Reserve		MGP Sites
	Number of Sites		(in millions)		(in millions)		Number of Sites		(in millions)		(in millions)
NU		61	$	31.7	$	28.6		59	$	31.7	$	28.9
CL&P		19		3.3		1.5		18		2.9		1.5
PSNH		19		6.8		5.8		18		6.6		5.8
WMECO		10		0.3		0.1		10		0.3		0.1