Jointly Owned Electric Utility Plant (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014 and 2013 were as follows:



	Nuclear generation												Fossil fuel generation							Transmission					Other
	Quad Cities			Peach Bottom			Salem ^(a)			Nine Mile Point Unit 2^(g)			Keystone ^(f)		Conemaugh ^(f)		Wyman			PA ^(b)		DE/NJ ^(c)			Other ^(d)
Operator	Generation			Generation			PSEG Nuclear			Generation			GenOn		GenOn		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, 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			—		—		—			—		—			—
Exelon’s share at December 31, 2013:
Plant ^(e)	$	941		$	883		$	501		$	—		$	725	$	399	$	3		$	14	$	64		$	2
Accumulated depreciation ^(e)	226			326			134			—			268		220		3			7		34			1
Construction work in progress	27			174			24			—			6		121		—			—		—			—

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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, 2014 and 2013.


(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.

- Definition

Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

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