Jointly Owned Electric Utility Plant (Exelon, Generation, PECO, BGE, PHI, Pepco, DPL and ACE)

12 Months Ended

Dec. 31, 2016

Public Utilities, Property, Plant and Equipment [Abstract]

Jointly Owned Electric Utility Plant (Exelon, Generation, PECO, BGE, PHI, Pepco, DPL and ACE)

Jointly Owned Electric Utility Plant (Exelon, Generation, PECO, BGE, PHI, Pepco, DPL and ACE)

Exelon's, Generation's, PECO's, BGE's, PHI's and ACE's undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2016 and 2015 were as follows:

	Nuclear Generation												Fossil Fuel Generation			Transmission				Other
	Quad Cities			Peach Bottom			Salem(a)			Nine Mile Point Unit 2			Wyman			PA(b)		NJ/ DE(c)		Other(d)
Operator	Generation			Generation			PSEG Nuclear			Generation			FP&L			First Energy		PSEG/ DPL		various
Ownership interest	75.00		%	50.00		%	42.59		%	82.00		%	5.89		%	various		various		various
Exelon’s share at December 31, 2016:
Plant(e)	$	1,054		$	1,384		$	596		$	830		$	3		$	27	$	97	$	15
Accumulated depreciation(e)	515			407			186			68			3			15		52		13
Construction work in progress	—			16			41			37			—			—		—		—
Exelon’s share at December 31, 2015:
Plant(e)	$	1,035		$	1,345		$	566		$	756		$	3		$	27	$	93	$	15
Accumulated depreciation(e)	309			368			167			42			3			15		52		13
Construction work in progress	11			18			40			56			—			—		—		—

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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, 2016 and 2015.

(b) PECO, BGE, Pepco, DPL and ACE own a 22%, 7%, 27%, 9% and 8% share, respectively, in 127 miles of 500kV lines located in Pennsylvania as well as a 20.72%, 10.56%, 9.72%, 3.72% and 3.83% 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, DPL and ACE own a 42.55%, 1% and 13.9% share, respectively in 151.3 miles of 500kV lines located in New Jersey and Delaware Station. PECO, DPL and ACE also own a 42.55%, 7.45% and 7.45% share, respectively, in 2.5 miles of 500kV line located over the Delaware River. ACE also has a 21.78% share in a 500kV New Freedom Switching

(d) Generation, DPL and ACE own a 44.24%, 4.83% and 11.91% share, respectively in assets located at Merrill Creek Reservoir located in New Jersey. Pepco, DPL and ACE own a 11.9%, 7.4% and 6.6% share, respectively, in Valley Forge Corporate Center.

(e) Excludes asset retirement costs.

Exelon’s, Generation’s, PECO’s, BGE’s, Pepco's, DPL's and ACE'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, BGE’s, Pepco's, DPL's and ACE'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, BGE’s, Pepco, DPL's and ACE's Consolidated Statements of Operations and Comprehensive Income.