Jointly-Owned Facilities (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 (dollars in thousands):

	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	1,887,729	$	1,095,878	$	25,185
Palo Verde Unit 2 (a)	16.8	%		638,419		369,372		20,852
Palo Verde Common	28.0	%	(b)	752,300		277,414		39,995
Palo Verde Sale Leaseback			(a)	351,050		245,275		—
Four Corners Generating Station	63.0	%		1,466,579		544,308		23,430
Cholla common facilities (c)	50.5	%		183,390		82,434		893
Transmission facilities:
ANPP 500kV System	33.5	%	(b)	129,587		49,340		2,705
Navajo Southern System	26.7	%	(b)	82,046		30,464		284
Palo Verde — Yuma 500kV System	19.0	%	(b)	15,304		6,729		530
Four Corners Switchyards	63.1	%	(b)	68,707		15,436		1,334
Phoenix — Mead System	17.1	%	(b)	39,329		18,527		44
Palo Verde — Rudd 500kV System	50.0	%		93,887		25,573		302
Morgan — Pinnacle Peak System	64.6	%	(b)	117,722		16,744		—
Round Valley System	50.0	%		515		153		—
Palo Verde — Morgan System	87.9	%	(b)	219,292		6,660		—
Hassayampa — North Gila System	80.0	%		142,541		9,805		—
Cholla 500kV Switchyard	85.7	%		5,078		1,414		38
Saguaro 500kV Switchyard	60.0	%		20,414		12,790		—
Kyrene — Knox System	50.0	%		578		307		—

(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.