Jointly Owned Electric Utility Plant (Exelon, Generation, PECO and BGE)

12 Months Ended

Dec. 31, 2015

Public Utilities, Property, Plant and Equipment [Abstract]

Jointly Owned Electric Utility Plant (Exelon, Generation, PECO and BGE)

(Exelon, Generation, PECO and BGE)

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.

(f) On April 1, 2014, Generation assumed operational control of CENG's nuclear fleet, and as of that date, CENG’s operations are consolidated into Generation’s financial statements. As of December 31, 2013, Generation’s ownership interest in CENG, including Nine Mile Point, was treated as an equity method investment, and thus did not represent an undivided Interest. See Note 5 - Investment in Constellation Energy Nuclear Group, LLC for additional information.

Exelon’s, Generation’s, PECO’s and BGE’s undivided ownership interests are financed with their funds and all operations are accounted for as if such participating interests were wholly-owned facilities. Exelon’s, Generation’s, PECO’s and BGE’s share of direct expenses of the jointly owned plants are included in Purchased power and fuel and Operating and maintenance expenses on Exelon’s and Generation’s Consolidated Statements of Operations and Comprehensive Income and in Operating and maintenance expenses on PECO’s and BGE’s Consolidated Statements of Operations and Comprehensive Income.