FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Fair Value By Balance Sheet Grouping Text Block

	As of December 31,
	2015				2014
Eversource	Carrying		Fair		Carrying		Fair
(Millions of Dollars)	Amount		Value		Amount		Value
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	157.9	$	155.6	$	153.6
Long-Term Debt		9,034.5		9,425.9		8,814.0		9,451.2

	As of December 31, 2015
	CL&P				NSTAR Electric				PSNH				WMECO
	Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)	Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not Subject to Mandatory Redemption	$	116.2	$	114.9	$	43.0	$	43.0	$	-	$	-	$	-	$	-
Long-Term Debt		2,763.7		3,031.6		2,029.8		2,182.4		1,071.0		1,121.2		517.3		551.8
	As of December 31, 2014
	CL&P				NSTAR Electric				PSNH				WMECO
	Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)	Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not Subject to Mandatory Redemption	$	116.2	$	112.0	$	43.0	$	41.6	$	-	$	-	$	-	$	-
Long-Term Debt		2,826.2		3,214.5		1,786.2		1,993.5		1,070.0		1,137.9		625.2		689.4