Jointly-Owned Facilities

12 Months Ended

Dec. 31, 2023

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

Jointly-Owned Facilities

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, 2023 (dollars in thousands):

	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	1,990,237	$	1,087,614	$	21,442
Palo Verde Unit 2 (a)	16.8	%		681,483		387,485		12,700
Palo Verde Common	28.0	%	(b)	857,807		356,962		65,911
Palo Verde Sale Leaseback			(a)	351,050		264,624		—
Four Corners Generating Station	63.0	%		1,748,436		659,780		29,586
Cholla Common Facilities (c)	50.5	%		250,994		167,357		7,487
Transmission facilities:
ANPP 500kV System	33.4	%	(b)	136,145		58,252		4,801
Navajo Southern System	25.2	%	(b)	87,185		36,743		550
Palo Verde — Yuma 500kV System	25.3	%	(b)	24,057		7,912		432
Four Corners Switchyards	57.5	%	(b)	84,279		21,918		161
Phoenix — Mead System	17.1	%	(b)	39,772		20,679		257
Palo Verde — Rudd 500kV System	50.0	%		95,736		32,665		731
Morgan — Pinnacle Peak System	63.2	%	(b)	117,080		26,990		229
Round Valley System	50.0	%		548		205		—
Palo Verde — Morgan System	87.5	%	(b)	268,629		40,962		8,053
Hassayampa — North Gila System	80.0	%		151,684		24,618		—
Cholla 500kV Switchyard	85.7	%		8,445		2,760		—
Saguaro 500kV Switchyard	60.0	%		21,627		14,060		17
Kyrene — Knox System	50.0	%		578		340		—
Agua Fria Switchyard	10.0	%		—		—		77

(a)See Note 17.

(b)Weighted-average of interests.

(c)PacifiCorp owns Cholla Unit 4 (see Note 3 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.