ASSET RETIREMENT OBLIGATIONS (TABLE)

12 Months Ended

Dec. 31, 2011

Notes To Consolidated Financial Statements [Abstract]

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

A reconciliation of the beginning and ending carrying amounts of Regulated companies' ARO liabilities are as follows:
NU	As of December 31,
(Millions of Dollars)	2011		2010
Balance as of Beginning of Year	$	53.3	$	50.6
Liabilities Incurred During the Year		2.1		0.2
Liabilities Settled During the Year		(0.8)		(1.2)
Accretion		3.5		3.3
Revisions in Estimated Cash Flows		(1.9)		0.4
Balance as of End of Year	$	56.2	$	53.3
	As of December 31,
	2011						2010
(Millions of Dollars)	CL&P		PSNH		WMECO		CL&P		PSNH		WMECO
Balance as of Beginning of Year	$	29.3	$	17.6	$	3.6	$	28.6	$	16.4	$	3.3
Liabilities Incurred During the Year		1.7		0.2		0.2		0.1		-		0.1
Liabilities Settled During the Year		(0.8)		-		-		(1.2)		-		-
Accretion		2.0		1.1		0.2		1.8		1.1		0.2
Revisions in Estimated Cash Flows		-		(1.9)		-		-		0.1		-
Balance as of End of Year	$	32.2	$	17.0	$	4.0	$	29.3	$	17.6	$	3.6