LEASES (Tables)

12 Months Ended

Dec. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule of Rent Expense [Table Text Block]

					NSTAR
(Millions of Dollars)	Eversource		CL&P		Electric		PSNH		WMECO
2015	$	12.1	$	12.5	$	9.6	$	2.8	$	2.2
2014		14.3		6.0		7.8		1.5		1.2
2013		16.3		8.1		6.7		1.7		2.9

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Capital Leases
(Millions of Dollars)	Eversource		CL&P		PSNH
2016	$	2.2	$	1.9	$	0.3
2017		2.1		1.9		0.2
2018		2.1		2.0		0.1
2019		2.0		2.0		0.0
2020		2.0		2.0		0.0
Thereafter		1.4		1.4		0.0
Future minimum lease payments		11.8		11.2		0.6
Less amount representing interest		3.6		3.6		0.0
Present value of future minimum lease payments	$	8.2	$	7.6	$	0.6

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Operating Leases					NSTAR
(Millions of Dollars)	Eversource		CL&P		Electric		PSNH		WMECO
2016	$	16.4	$	2.9	$	9.7	$	0.8	$	0.8
2017		13.8		2.0		8.5		0.7		0.7
2018		10.4		1.3		6.5		0.5		0.6
2019		8.5		1.0		5.3		0.4		0.5
2020		6.8		0.7		4.3		0.3		0.5
Thereafter		15.4		1.7		9.0		0.7		1.8
Future minimum lease payments	$	71.3	$	9.6	$	43.3	$	3.4	$	4.9