Environmental Matters (Tables)

12 Months Ended

Dec. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Environmental Loss Contingencies By Site Text Block

(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		WMECO
Balance as of January 1, 2014	$	35.4	$	3.4	$	1.2	$	5.4	$	0.4
Additions		12.7		1.0		-		0.1		0.2
Payments/Reductions		(4.8)		(0.6)		(0.1)		(0.3)		(0.1)
Balance as of December 31, 2014		43.3		3.8		1.1		5.2		0.5
Additions		13.5		1.3		2.0		2.3		0.2
Payments/Reductions		(5.7)		(0.5)		(0.7)		(3.0)		(0.1)
Balance as of December 31, 2015	$	51.1	$	4.6	$	2.4	$	4.5	$	0.6

	As of December 31, 2015				As of December 31, 2014
			Reserve				Reserve
	Number of Sites		(in millions)		Number of Sites		(in millions)
Eversource		64	$	51.1		65	$	43.3
CL&P		14		4.6		16		3.8
NSTAR Electric		15		2.4		13		1.1
PSNH		12		4.5		13		5.2
WMECO		4		0.6		4		0.5