Allowance for Funds Used During Construction (Tables)

12 Months Ended

Dec. 31, 2012

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Allowance For Funds Used During Construction [Table Text Block]

NU		For the Years Ended December 31,
(Millions of Dollars, except percentages)		2012		2011		2010
AFUDC:
	Borrowed Funds	$	5.3	$	11.8	$	10.2
	Equity Funds		6.8		22.5		16.7
Total		$	12.1	$	34.3	$	26.9
Average AFUDC Rate			3.7%		7.3%		7.1%

		For the Years Ended December 31,
		2012								2011								2010
(Millions of Dollars,				NSTAR								NSTAR								NSTAR
except percentages)		CL&P		Electric(1)		PSNH		WMECO		CL&P		Electric(1)		PSNH		WMECO		CL&P		Electric(1)		PSNH		WMECO
AFUDC:
	Borrowed Funds	$	2.5	$	0.3	$	1.6	$	0.5	$	3.3	$	0.2	$	7.1	$	0.5	$	2.7	$	0.1	$	6.6	$	0.3
	Equity Funds		1.9		-		1.9		1.0		6.0		-		13.2		1.0		4.9		-		10.4		0.6
Total		$	4.4	$	0.3	$	3.5	$	1.5	$	9.3	$	0.2	$	20.3	$	1.5	$	7.6	$	0.1	$	17.0	$	0.9
Average AFUDC Rate			3.6%		0.4%		5.9%		6.8%		8.3%		0.3%		7.1%		7.4%		8.3%		0.3%		6.8%		6.4%