Operating Expenses (Tables)

12 Months Ended

Dec. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule of Fuel Costs [Table Text Block]

	For the Years Ended December 31,
(Millions of Dollars)	2014		2013		2012
NU- Natural Gas and Fuel (1)	$	599.4	$	466.5	$	346.8
PSNH - Fuel		113.4		104.8		103.4
(1) NSTAR Gas natural gas costs were included in NU beginning April 10, 2012.