Fuel Materials and Supplies and Allowance Inventory (Tables)

12 Months Ended

Dec. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Utility Inventory [Table Text Block]

	As of December 31,
	2015						2014
			NSTAR						NSTAR
(Millions of Dollars)	Eversource		Electric		PSNH		Eversource		Electric		PSNH
Current:
Fuel	$	152.5	$	-	$	103.4	$	164.3	$	-	$	95.1
Materials and Supplies		131.2		32.2		44.6		159.5		49.1		52.2
RECs		50.9		43.3		7.0		25.8		25.1		0.7
Emission Allowances		1.9		-		1.9		0.1		-		0.1
Long-Term:
Emission Allowances		17.5		-		17.5		20.1		-		20.1