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Jointly-Owned Facilities (Tables)
 12 Months Ended
Dec. 31, 2025
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule Of 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, 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.