LONG-TERM DEBT (TABLES)

12 Months Ended

Dec. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule of Maturities of Long-term Debt [Table Text Block]

(Millions of Dollars)	NU		CL&P		NSTAR Electric		PSNH		WMECO
2015	$	216.7	$	162.0	$	4.7	$	-	$	50.0
2016		200.0		-		200.0		-		-
2017		745.0		250.0		400.0		70.0		-
2018		810.0		300.0		-		110.0		-
2019		800.0		250.0		-		150.0		-
Thereafter		4,956.6		1,640.3		1,200.0		746.3		515.0
Total	$	7,728.3	$	2,602.3	$	1,804.7	$	1,076.3	$	565.0

Schedule of Long-term Debt Instruments [Table Text Block]

CL&P		As of December 31,
(Millions of Dollars)		2014		2013
First Mortgage Bonds:
	7.875% 1994 Series D due 2024	$	139.8	$	139.8
	4.800% 2004 Series A due 2014 (1)		-		150.0
	5.750% 2004 Series B due 2034		130.0		130.0
	5.000% 2005 Series A due 2015		100.0		100.0
	5.625% 2005 Series B due 2035		100.0		100.0
	6.350% 2006 Series A due 2036		250.0		250.0
	5.375% 2007 Series A due 2017		150.0		150.0
	5.750% 2007 Series B due 2037		150.0		150.0
	5.750% 2007 Series C due 2017		100.0		100.0
	6.375% 2007 Series D due 2037		100.0		100.0
	5.650% 2008 Series A due 2018		300.0		300.0
	5.500% 2009 Series A due 2019		250.0		250.0
	2.500% 2013 Series A due 2023		400.0		400.0
	4.300% 2014 Series A due 2044 (2)		250.0		-
Total First Mortgage Bonds			2,419.8		2,319.8
Pollution Control Revenue Bonds:
	4.375% Fixed Rate Tax Exempt due 2028		120.5		120.5
	1.550% Fixed Rate Tax Exempt due 2031 (3)		62.0		62.0
Total Pollution Control Revenue Bonds			182.5		182.5
Spent Nuclear Fuel Obligation			244.5		244.4
Less Amounts due Within One Year			(162.0)		(150.0)
Unamortized Premiums and Discounts, Net			(4.8)		(5.5)
CL&P Long-Term Debt		$	2,680.0	$	2,591.2
NSTAR Electric		As of December 31,
(Millions of Dollars)		2014		2013
Debentures:
	4.875% due 2014 (4)	$	-	$	300.0
	5.750% due 2036		200.0		200.0
	5.625% due 2017		400.0		400.0
	5.500% due 2040		300.0		300.0
	2.375% due 2022		400.0		400.0
	Variable Rate due 2016 (5)		200.0		200.0
	4.400% due 2044 (4)		300.0		-
Total Debentures			1,800.0		1,800.0
Bonds:
	7.375% Tax Exempt Sewage Facility Revenue Bonds, due 2015		4.7		6.4
Total Bonds			4.7		6.4
Less Amounts due Within One Year			(4.7)		(301.7)
Unamortized Premiums and Discounts, Net			(7.3)		(5.3)
NSTAR Electric Long-Term Debt		$	1,792.7	$	1,499.4
PSNH		As of December 31,
(Millions of Dollars)		2014		2013
First Mortgage Bonds:
	5.25% Series L due 2014 (6)	$	-	$	50.0
	5.60% Series M due 2035		50.0		50.0
	6.15% Series N due 2017		70.0		70.0
	6.00% Series O due 2018		110.0		110.0
	4.50% Series P due 2019		150.0		150.0
	4.05% Series Q due 2021		122.0		122.0
	3.20% Series R due 2021		160.0		160.0
	3.50% Series S due 2023 (7)		325.0		250.0
Total First Mortgage Bonds			987.0		962.0
Pollution Control Revenue Bonds:
	Adjustable Rate Tax Exempt Series A due 2021		89.3		89.3
Total Pollution Control Revenue Bonds			89.3		89.3
Less Amounts due Within One Year			-		(50.0)
Unamortized Premiums and Discounts, Net			-		(2.3)
PSNH Long-Term Debt		$	1,076.3	$	999.0

WMECO		As of December 31,
(Millions of Dollars)		2014		2013
Notes:
	5.90% Senior Notes Series B, due 2034	$	50.0	$	50.0
	5.24% Senior Notes Series C, due 2015		50.0		50.0
	6.70% Senior Notes Series D, due 2037		40.0		40.0
	5.10% Senior Notes Series E, due 2020		95.0		95.0
	3.50% Senior Notes Series F, due 2021		250.0		250.0
	3.88% Senior Notes Series G, due 2023		80.0		80.0
Total Notes			565.0		565.0
Spent Nuclear Fuel Obligation			57.4		57.3
Less Amounts due Within One Year			(50.0)		-
Unamortized Premiums and Discounts, Net			6.1		7.1
WMECO Long-Term Debt		$	578.5	$	629.4
OTHER		As of December 31,
(Millions of Dollars)		2014			2013
Yankee Gas - First Mortgage Bonds:
	8.48% Series B due 2022	$	20.0	$	20.0
	4.80% Series G due 2014 (8)		-		75.0
	5.26% Series H due 2019		50.0		50.0
	5.35% Series I due 2035		50.0		50.0
	6.90% Series J due 2018		100.0		100.0
	4.87% Series K due 2020		50.0		50.0
	4.82% Series L due 2044 (8)		100.0		-
Total First Mortgage Bonds			370.0		345.0
Unamortized Premium			0.6		0.7
Yankee Gas Long-Term Debt			370.6		345.7
NSTAR Gas - First Mortgage Bonds:
	9.95% Series J due 2020		25.0		25.0
	7.11% Series K due 2033		35.0		35.0
	7.04% Series M due 2017		25.0		25.0
	4.46% Series N due 2020		125.0		125.0
NSTAR Gas Long-Term Debt			210.0		210.0
Other - Notes and Debentures:
	1.45% Senior Notes Series E due 2018 (NU Parent)		300.0		300.0
	2.80% Senior Notes Series F due 2023 (NU Parent)		450.0		450.0
	4.50% Debentures due 2019 (NU Parent)		350.0		350.0
	NU Commercial Paper Borrowings(8) (9)		446.3		25.0
	Spent Nuclear Fuel Obligation (CYAPC)		179.4		179.4
Total Other Notes and Debentures			1,725.7		1,304.4
Fair Value Adjustment (10)			202.3		230.7
Less Amounts due Within One Year			-		-
Less Fair Value Adjustment - Current Portion (10)			(28.9)		(31.7)
Unamortized Premiums and Discounts, Net			(1.2)		(1.3)
Total Other Long-Term Debt		$	2,478.5	$	2,057.8
Total NU Long-Term Debt		$	8,606.0	$	7,776.8