ASSET RETIREMENT OBLIGATIONS (TABLE)

12 Months Ended

Dec. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

NU			As of December 31,
(Millions of Dollars)			2014		2013
Balance as of Beginning of Year			$	424.9	$	412.2
Liabilities Incurred During the Year				1.3		0.1
Liabilities Settled During the Year				(19.5)		(13.8)
Accretion				25.1		23.8
Revisions in Estimated Cash Flows				(5.5)		2.6
Balance as of End of Year			$	426.3	$	424.9
	As of December 31,
	2014								2013
			NSTAR								NSTAR
(Millions of Dollars)	CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Balance as of Beginning of Year	$	35.0	$	32.8	$	19.5	$	4.5	$	33.6	$	31.4	$	18.4	$	4.3
Liabilities Incurred During the Year		-		-		-		1.1		-		-		-		-
Liabilities Settled During the Year		(1.1)		-		-		-		(0.7)		(0.1)		-		-
Accretion		1.9		1.5		1.1		0.3		2.2		1.5		1.2		0.3
Revisions in Estimated Cash Flows		(0.5)		-		-		-		(0.1)		-		(0.1)		(0.1)
Balance as of End of Year	$	35.3	$	34.3	$	20.6	$	5.9	$	35.0	$	32.8	$	19.5	$	4.5