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MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of March 31, 2014
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains⁽¹⁾			Losses⁽¹⁾			Fair Value
NU
	Debt Securities⁽²⁾	$	300.6		$	4.8		$	(0.7)		$	304.7
	Equity Securities⁽²⁾		163.3			65.6			-			228.9

WMECO
	Debt Securities		58.0			-			(0.1)			57.9

		As of December 31, 2013
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains⁽¹⁾			Losses⁽¹⁾			Fair Value
NU
	Debt Securities⁽²⁾	$	299.2		$	2.5		$	(2.1)		$	299.6
	Equity Securities⁽²⁾		163.6			60.5			-			224.1

WMECO
	Debt Securities		57.9			-			-			57.9

Investments Classified by Contractual Maturity Date [Table Text Block]

		NU						WMECO
		Amortized						Amortized
(Millions of Dollars)		Cost			Fair Value			Cost			Fair Value
Less than one year⁽¹⁾		$	54.5		$	54.4		$	19.2		$	19.2
One to five years			73.3			73.9			33.2			33.2
Six to ten years			68.1			69.4			1.6			1.6
Greater than ten years			104.7			107.0			4.0			3.9
Total Debt Securities		$	300.6		$	304.7		$	58.0		$	57.9

Fair Value Heirarchy [Table Text Block]

				NU						WMECO
				As of						As of
(Millions of Dollars)				March 31, 2014			December 31, 2013			March 31, 2014			December 31, 2013
Level 1:
	Mutual Funds and Equities			$	310.3		$	281.3		$	-		$	-
	Money Market Funds				22.5			32.9			4.3			10.9
Total Level 1				$	332.8		$	314.2		$	4.3		$	10.9
Level 2:
	U.S. Government Issued Debt Securities
		(Agency and Treasury)		$	56.7		$	61.4		$	-		$	6.8
	Corporate Debt Securities				56.3			53.6			14.1			15.1
	Asset-Backed Debt Securities				35.3			30.4			14.0			9.0
	Municipal Bonds				109.6			105.5			12.3			11.2
	Other Fixed Income Securities				24.3			15.8			13.2			4.9
Total Level 2				$	282.2		$	266.7		$	53.6		$	47.0
Total Marketable Securities				$	615.0		$	580.9		$	57.9		$	57.9