DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block

		As of March 31, 2014
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability)
Current Derivative Assets:
Level 2:
	NU (1)	$	1.2	$	(0.1)	$	1.1
Level 3:
	NU (1)		17.8		(9.7)		8.1
	CL&P (1)		17.0		(9.7)		7.3
	NSTAR Electric		0.8		-		0.8
Long-Term Derivative Assets:
Level 3:
	NU, CL&P (1)	$	98.8	$	(31.7)	$	67.1
Current Derivative Liabilities:
Level 3:
	NU	$	(93.3)	$	-	$	(93.3)
	CL&P		(92.0)		-		(92.0)
	NSTAR Electric		(1.3)		-		(1.3)
Long-Term Derivative Liabilities:
Level 2:
	NU	$	(0.2)	$	-	$	(0.2)
Level 3:
	NU		(546.2)		-		(546.2)
	CL&P		(539.4)		-		(539.4)
	NSTAR Electric		(6.8)		-		(6.8)

		As of December 31, 2013
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability)
Current Derivative Assets:
Level 2:
	NU (1)	$	1.9	$	(0.3)	$	1.6
Level 3:
	NU (1)		18.4		(9.8)		8.6
	CL&P (1)		17.1		(9.8)		7.3
	NSTAR Electric		1.2		-		1.2
Long-Term Derivative Assets:
Level 2:
	NU	$	0.2	$	-	$	0.2
Level 3:
	NU (1)		116.2		(42.2)		74.0
	CL&P (1)		113.6		(42.2)		71.4
Current Derivative Liabilities:
Level 3:
	NU	$	(93.7)	$	-	$	(93.7)
	CL&P		(92.2)		-		(92.2)
	NSTAR Electric		(1.5)		-		(1.5)
Long-Term Derivative Liabilities:
Level 3:
	NU	$	(624.1)	$	-	$	(624.1)
	CL&P		(617.1)		-		(617.1)
	NSTAR Electric		(7.0)		-		(7.0)

Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance Text Block

Location of Amounts		Amounts Recognized on Derivatives
Recognized on Derivatives		For the Three Months Ended March 31,
(Millions of Dollars)		2014		2013
NU
Balance Sheets:
	Regulatory Assets and Liabilities	$	54.1	$	28.0
Statements of Income:
	Purchased Power, Fuel and Transmission		-		0.3

Rollforward Of Net Derivative Asset Liabilities Valued Using Unobservable Inputs [Table Text Block]

		For the Three Months Ended March 31,
		2014		2013
(Millions of Dollars)		NU		NU
Derivatives, Net:
Fair Value as of Beginning of Period		$	(635.2)	$	(878.6)
Net Realized/Unrealized Gains Included in:
	Net Income (1)		-		5.7
	Regulatory Assets and Liabilities		49.2		26.2
Settlements			21.7		13.6
Fair Value as of End of Period		$	(564.3)	$	(833.1)

		For the Three Months Ended
		March 31, 2014				March 31, 2013
(Millions of Dollars)		CL&P		NSTAR Electric		CL&P		NSTAR Electric
Derivatives, Net:
Fair Value as of Beginning of Period		$	(630.6)	$	(7.3)	$	(866.2)	$	(14.9)
Net Realized/Unrealized Gains/(Losses)
	Included in Regulatory Assets and Liabilities		52.0		(0.1)		24.3		0.7
Settlements			21.6		0.1		22.3		0.6
Fair Value as of End of Period		$	(557.0)	$	(7.3)	$	(819.6)	$	(13.6)

Fairvalueinputsliabilitiesquantitativeinformationtabletextblock

	As of March 31, 2014							As of December 31, 2013
		Range					Period Covered		Range					Period Covered
Energy Prices:
NU	$	57	-	60	per MWh		2018 - 2020	$	49	-	77	per MWh		2018 - 2029
CL&P	$	57	-	60	per MWh		2018 - 2020	$	56	-	58	per MWh		2018 - 2029
Capacity Prices:
NU	$	1.70	-	10.42		per kW-Month	2016 - 2026	$	5.07	-	11.82		per kW-Month	2017 - 2029
CL&P	$	5.23	-	10.42		per kW-Month	2018 - 2026	$	5.07	-	10.42		per kW-Month	2017 - 2026
NSTAR Electric	$	1.70	-	7.38		per kW-Month	2016 - 2019	$	5.07	-	7.38		per kW-Month	2017 - 2019
Forward Reserve:
NU, CL&P	$	3.30	-	3.30		per kW-Month	2014 - 2024	$	3.30	-	3.30		per kW-Month	2014 - 2024
REC Prices:
NU	$	38	-	70	per REC		2014 - 2018	$	36	-	87	per REC		2014 - 2029
NSTAR Electric	$	38	-	70	per REC		2014 - 2018	$	36	-	70	per REC		2014 - 2018