Environmental Matters (Tablels)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Environmental Loss Contingencies By Site Text Block

	As of March 31, 2013				As of December 31, 2012
			Reserve				Reserve
	Number of Sites		(in millions)		Number of Sites		(in millions)
NU		72	$	40.7		77	$	39.4
CL&P		19		3.6		19		3.7
NSTAR Electric		14		1.5		16		1.7
PSNH		16		5.6		16		4.9
WMECO		5		0.5		6		0.6