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Jointly-Owned Facilities
 12 Months Ended
Dec. 31, 2025
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, 2025 (dollars in thousands):
 Percent
Owned		 Plant in
Service		Accumulated
Depreciation		Construction
Work in
Progress
Generating facilities:     
Palo Verde Units 1 and 329.1 %$2,094,060 $1,079,823 $13,230 
Palo Verde Unit 2 (a)23.9 %925,562 567,731 7,343 
Palo Verde Common26.2 %(b)977,526 431,023 58,899 
Palo Verde sale leaseback (a) 142,921 110,886 — 
Four Corners Generating Station 63.0 %1,941,053 747,931 19,378 
Transmission facilities:     
Arizona Nuclear Power Project 500kV System33.1 %(b)141,348 60,579 5,350 
Navajo Southern System25.1 %(b)89,856 40,548 1,645 
Palo Verde — Yuma 500kV System16.1 %(b)44,505 9,060 136 
Four Corners Switchyards56.9 %(b)86,706 25,810 118 
Phoenix — Mead System17.5 %(b)36,290 19,568 609 
Palo Verde — Rudd 500kV System50.0 %96,428 35,842 3,343 
Morgan — Pinnacle Peak System63.2 %(b)119,104 31,283 75 
Round Valley System50.0 %548 224 — 
Palo Verde — Morgan System87.5 %(b)268,202 52,822 392 
Hassayampa — North Gila System80.0 %154,329 31,361 — 
Cholla 500kV Switchyard85.7 %8,456 3,114 190 
Saguaro 500kV Switchyard60.0 %42,795 16,324 800 
Kyrene — Knox System50.0 %578 359 — 
(a)See Note 12 for information related to the Palo Verde sale leaseback purchases.
(b)Weighted-average of interests.