Jointly Owned Electric Utility Plant (Tables)

12 Months Ended

Dec. 31, 2015

Public Utilities, Property, Plant and Equipment [Abstract]

Schedule of Jointly Owned Utility Plants

Exelon, Generation, PECO and BGE’s undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2015 and 2014 were as follows:

	Nuclear Generation												Fossil Fuel Generation			Transmission					Other
	Quad Cities			Peach Bottom			Salem (a)			Nine Mile Point Unit 2(f)			Wyman			PA (b)		DE/NJ (c)			Other (d)
Operator	Generation			Generation			PSEG Nuclear			Generation			FP&L			First Energy		PSEG
Ownership interest	75.00		%	50.00		%	42.59		%	82.00		%	5.89		%	Various		42.55		%	44.24		%
Exelon’s share at December 31, 2015:
Plant (e)	$	1,035		$	1,345		$	566		$	756		$	3		$	15	$	65		$	1
Accumulated    depreciation (e)	309			368			167			42			3			7		35			1
Construction work    in progress	11			18			40			56			—			—		—			—
Exelon’s share at December 31, 2014:
Plant (e)	$	995		$	1,095		$	531		$	676		$	3		$	14	$	64		$	2
Accumulated depreciation (e)	266			343			150			14			3			7		34			1
Construction work    in progress	15			133			29			48			—			—		—			—

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(a) Generation also owns a proportionate share in the fossil fuel combustion turbine at Salem, which is fully depreciated. The gross book value was $3 million at December 31, 2015 and 2014.

(b) PECO and BGE own a 22% and 7% share, respectively, in 127 miles of 500kV lines located in Pennsylvania; PECO and BGE also own a 20.7% and 10.56% share, respectively, of a 500kV substation immediately outside of the Conemaugh fossil generating station which supplies power to the 500kV lines including, but not limited to, the lines noted above.

(c) PECO owns a 42.55% share in 131 miles of 500kV lines located in Delaware and New Jersey as well as a 42.55% share in a 500kV substation immediately outside of the Salem nuclear generating station in New Jersey which supplies power to the 500kV lines including, but not limited to, the lines noted above.

(d) Generation has a 44.24% ownership interest in assets located at Merrill Creek Reservoir located in New Jersey.

(e) Excludes asset retirement costs.