PROPERTY, PLANT AND ACCUMULATED DEPRECIATION (Tables)

3 Months Ended

Mar. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule of Public Utility Property, Plant, and Equipment [Text Block]

		As of March 31, 2015		As of December 31, 2014
(Millions of Dollars)		ES		ES
Distribution - Electric		$	12,539.3	$	12,495.2
Distribution - Natural Gas			2,584.8		2,595.4
Transmission			6,959.4		6,930.7
Generation			1,172.2		1,170.9
Electric and Natural Gas Utility			23,255.7		23,192.2
Other (1)			547.9		551.3
Property, Plant and Equipment, Gross			23,803.6		23,743.5
Less: Accumulated Depreciation
	Electric and Natural Gas Utility		(5,842.6)		(5,777.8)
	Other		(232.3)		(231.8)
Total Accumulated Depreciation			(6,074.9)		(6,009.6)
Property, Plant and Equipment, Net			17,728.7		17,733.9
Construction Work in Progress			1,082.0		913.1
Total Property, Plant and Equipment, Net		$	18,810.7	$	18,647.0

	As of March 31, 2015								As of December 31, 2014
			NSTAR								NSTAR
(Millions of Dollars)	CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Distribution	$	5,180.0	$	4,907.8	$	1,704.1	$	787.4	$	5,158.8	$	4,895.5	$	1,696.7	$	784.2
Transmission		3,274.7		1,950.6		794.6		891.9		3,274.0		1,928.5		789.7		891.0
Generation		-		-		1,137.8		34.4		-		-		1,136.5		34.4
Property, Plant and Equipment, Gross		8,454.7		6,858.4		3,636.5		1,713.7		8,432.8		6,824.0		3,622.9		1,709.6
Less: Accumulated Depreciation		(1,950.7)		(1,783.6)		(1,105.7)		(303.3)		(1,928.0)		(1,761.4)		(1,090.0)		(297.4)
Property, Plant and Equipment, Net		6,504.0		5,074.8		2,530.8		1,410.4		6,504.8		5,062.6		2,532.9		1,412.2
Construction Work in Progress		370.9		289.5		135.5		73.5		304.9		272.8		102.9		49.1
Total Property, Plant and Equipment, Net	$	6,874.9	$	5,364.3	$	2,666.3	$	1,483.9	$	6,809.7	$	5,335.4	$	2,635.8	$	1,461.3