Jointly-Owned Facilities (Tables)

12 Months Ended

Dec. 31, 2016

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

APS's interests in jointly-owned facilities recorded on the Consolidated Balance Sheets

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%