Jointly-Owned Facilities

APS shares ownership of some of its generating and transmission facilities with other companies. We are responsible for our share of operating costs which are included in the corresponding operating expenses on our Consolidated Statements of Income. We are also responsible for providing our own financing. Our share of operating expenses and utility plant costs related to these facilities is accounted for using proportional consolidation. The following table shows APS’s interests in those jointly-owned facilities recorded on the Consolidated Balance Sheets at December 31, 2016 (dollars in thousands):



	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	1,770,324	$	1,080,072	$	17,615
Palo Verde Unit 2 (a)	16.8	%		581,572		360,757		9,717
Palo Verde Common	28.0	%	(b)	672,799		242,649		62,479
Palo Verde Sale Leaseback			(a)	351,050		237,535		—
Four Corners Generating Station	63.0	%		934,837		578,924		248,072
Navajo Generating Station Units 1, 2 and 3	14.0	%		279,629		176,931		5,761
Cholla common facilities (c)	63.3	%	(b)	159,707		58,276		806		(d)
Transmission facilities:
ANPP 500kV System	33.6	%	(b)	127,970		38,610		2,291
Navajo Southern System	22.5	%	(b)	62,135		20,491		334
Palo Verde — Yuma 500kV System	19.0	%	(b)	13,699		5,368		408
Four Corners Switchyards	51.3	%	(b)	39,850		10,474		1,044
Phoenix — Mead System	17.1	%	(b)	39,330		13,725		85
Palo Verde — Rudd 500kV System	50.0	%	(b)	91,904		19,818		227
Morgan — Pinnacle Peak System	65.2	%	(b)	140,374		13,557		—
Round Valley System	50.0	%	(b)	515		127		—
Palo Verde — Morgan System	85.8	%	(b)	125,908		1,326		28,949
Hassayampa — North Gila System	80.0	%	(b)	142,541		3,231		—
Cholla 500kV Switchyard	85.7	%	(b)	5,078		1,201		—
Saguaro 500kV Switchyard	75.0	%	(b)	20,456		12,426		2


(a)	See Note 18.


(b)	Weighted-average of interests.


(c)	PacifiCorp owns Cholla Unit 4 and APS operates the unit for PacifiCorp. The common facilities at Cholla are jointly-owned.


(d)	Due to the closure of Cholla Unit 2 in 2015, all new Cholla common facilities construction is owned by APS at 50.5%

4CA is a subsidiary that was formed in 2016 as a result of the purchase of El Paso's 7% interest in Four Corners. At December 31, 2016, 4CA had plant in service of $110 million, accumulated depreciation of $79 million and construction work in progress of $30 million.