PROPERTY, PLANT AND ACCUMULATED DEPRECIATION (Tables)

3 Months Ended

Sep. 30, 2015

Notes To Consolidated Financial Statements [Abstract]

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

		As of September 30, 2015		As of December 31, 2014
(Millions of Dollars)		Eversource		Eversource
Distribution - Electric		$	12,821.6	$	12,495.2
Distribution - Natural Gas			2,657.5		2,595.4
Transmission			7,260.6		6,930.7
Generation			1,180.0		1,170.9
Electric and Natural Gas Utility			23,919.7		23,192.2
Other (1)			555.3		551.3
Property, Plant and Equipment, Gross			24,475.0		23,743.5
Less: Accumulated Depreciation
	Electric and Natural Gas Utility		(6,041.5)		(5,777.8)
	Other		(247.6)		(231.8)
Total Accumulated Depreciation			(6,289.1)		(6,009.6)
Property, Plant and Equipment, Net			18,185.9		17,733.9
Construction Work in Progress			1,220.1		913.1
Total Property, Plant and Equipment, Net		$	19,406.0	$	18,647.0

	As of September 30, 2015								As of December 31, 2014
			NSTAR								NSTAR
(Millions of Dollars)	CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Distribution	$	5,289.6	$	5,001.9	$	1,772.0	$	798.1	$	5,158.8	$	4,895.5	$	1,696.7	$	784.2
Transmission		3,480.5		1,995.3		839.9		896.7		3,274.0		1,928.5		789.7		891.0
Generation		-		-		1,145.5		34.5		-		-		1,136.5		34.4
Property, Plant and Equipment, Gross		8,770.1		6,997.2		3,757.4		1,729.3		8,432.8		6,824.0		3,622.9		1,709.6
Less: Accumulated Depreciation		(2,007.9)		(1,857.9)		(1,149.6)		(302.6)		(1,928.0)		(1,761.4)		(1,090.0)		(297.4)
Property, Plant and Equipment, Net		6,762.2		5,139.3		2,607.8		1,426.7		6,504.8		5,062.6		2,532.9		1,412.2
Construction Work in Progress		246.4		405.8		160.4		105.0		304.9		272.8		102.9		49.1
Total Property, Plant and Equipment, Net	$	7,008.6	$	5,545.1	$	2,768.2	$	1,531.7	$	6,809.7	$	5,335.4	$	2,635.8	$	1,461.3