ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)

12 Months Ended

Dec. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Accumulated Other Comprehensive Income Loss Table Text Block

		For the Year Ended December 31, 2015								For the Year Ended December 31, 2014
		Qualified		Unrealized						Qualified		Unrealized
		Cash Flow		Gains/(Losses)		Defined				Cash Flow		Gains on		Defined
Eversource		Hedging		on Marketable		Benefit				Hedging		Marketable		Benefit
(Millions of Dollars)		Instruments		Securities		Plans		Total		Instruments		Securities		Plans		Total
Balance as of January 1st		$	(12.4)	$	0.7	$	(62.3)	$	(74.0)	$	(14.4)	$	0.4	$	(32.0)	$	(46.0)
OCI Before Reclassifications			-		(2.6)		3.5		0.9		-		0.3		(34.2)		(33.9)
Amounts Reclassified from AOCI			2.1		-		4.2		6.3		2.0		-		3.9		5.9
	Net OCI		2.1		(2.6)		7.7		7.2		2.0		0.3		(30.3)		(28.0)
Balance as of December 31st		$	(10.3)	$	(1.9)	$	(54.6)	$	(66.8)	$	(12.4)	$	0.7	$	(62.3)	$	(74.0)

Schedule Of Comprehensive Income Loss [Table Text Block]

	Amounts Reclassified from AOCI
Eversource	For the Years Ended December 31,						Statements of Income
(Millions of Dollars)	2015		2014		2013		Line Item Impacted
Qualified Cash Flow Hedging Instruments	$	(3.5)	$	(3.4)	$	(3.4)	Interest Expense
Tax Effect		1.4		1.4		1.4	Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax	$	(2.1)	$	(2.0)	$	(2.0)
Defined Benefit Plan Costs:
Amortization of Actuarial Losses	$	(6.6)	$	(6.2)	$	(10.5)	Operations and Maintenance (1)
Amortization of Prior Service Cost		(0.2)		(0.2)		(0.2)	Operations and Maintenance (1)
Total Defined Benefit Plan Costs		(6.8)		(6.4)		(10.7)
Tax Effect		2.6		2.5		4.3	Income Tax Expense
Defined Benefit Plan Costs, Net of Tax	$	(4.2)	$	(3.9)	$	(6.4)
Total Amounts Reclassified from AOCI, Net of Tax	$	(6.3)	$	(5.9)	$	(8.4)