Jointly-Owned Facilities (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 (dollars in thousands):

	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	1,911,339	$	1,108,883	$	26,623
Palo Verde Unit 2 (a)	16.8	%		649,035		379,305		7,268
Palo Verde Common	28.0	%	(b)	774,054		320,107		41,607
Palo Verde Sale Leaseback			(a)	351,050		253,014		—
Four Corners Generating Station	63.0	%		1,621,418		581,436		35,028
Cholla common facilities (c)	50.5	%		193,807		109,447		1,206
Transmission facilities:
ANPP 500kV System	33.5	%	(b)	131,991		52,626		3,859
Navajo Southern System	26.0	%	(b)	89,113		33,536		1,215
Palo Verde — Yuma 500kV System	25.3	%	(b)	23,247		6,681		433
Four Corners Switchyards	61.8	%	(b)	69,441		17,009		3,145
Phoenix — Mead System	17.1	%	(b)	39,437		19,072		73
Palo Verde — Rudd 500kV System	50.0	%		93,123		28,206		1,921
Morgan — Pinnacle Peak System	64.6	%	(b)	117,497		20,754		912
Round Valley System	50.0	%		531		174		13
Palo Verde — Morgan System	88.9	%	(b)	257,220		20,943		530
Hassayampa — North Gila System	80.0	%		148,067		16,080		—
Cholla 500kV Switchyard	85.7	%		7,896		1,850		940
Saguaro 500kV Switchyard	60.0	%		21,669		13,229		2
Kyrene — Knox System	50.0	%		578		323		—

(a)See Note 18.

(b)Weighted-average of interests.

(c)PacifiCorp owns Cholla Unit 4 (see Note 4 for additional information) and APS operates the unit for PacifiCorp.  The common facilities at Cholla are jointly-owned. Cholla Unit 4 was retired on December 24, 2020.