Jointly-Owned Facilities (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021 (dollars in thousands):

	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	1,932,629	$	1,113,905	$	28,288
Palo Verde Unit 2 (a)	16.8	%		657,102		384,193		14,084
Palo Verde Common	28.0	%	(b)	792,849		334,804		43,690
Palo Verde Sale Leaseback			(a)	351,050		256,884		—
Four Corners Generating Station	63.0	%		1,686,702		608,247		21,515
Cholla Common Facilities (c)	50.5	%		208,709		121,877		1,608
Transmission facilities:
ANPP 500kV System	33.5	%	(b)	133,289		53,708		115
Navajo Southern System	26.8	%	(b)	89,895		35,144		1,535
Palo Verde — Yuma 500kV System	25.8	%	(b)	23,650		7,188		716
Four Corners Switchyards	60.1	%	(b)	73,133		18,637		258
Phoenix — Mead System	17.1	%	(b)	39,523		20,150		—
Palo Verde — Rudd 500kV System	50.0	%		96,376		29,426		—
Morgan — Pinnacle Peak System	64.7	%	(b)	119,814		23,575		138
Round Valley System	50.0	%		535		180		—
Palo Verde — Morgan System	87.8	%	(b)	259,180		27,995		268
Hassayampa — North Gila System	80.0	%		148,039		19,317		—
Cholla 500kV Switchyard	85.7	%		8,287		2,163		5
Saguaro 500kV Switchyard	60.0	%		21,655		13,471		—
Kyrene — Knox System	50.0	%		578		328		—

(a)See Note 18.

(b)Weighted-average of interests.

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