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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment
Pinnacle West’s property, plant and equipment included in the December 31, 2025, and 2024 Consolidated Balance Sheets is composed of the following (dollars in thousands):

Property, Plant and Equipment:20252024
Generation$9,687,466 $9,675,576 
Transmission4,451,936 4,135,970 
Distribution9,626,629 9,016,843 
Energy storage515,935 276,954 
Solar plant1,501,301 1,159,385 
General plant1,587,029 1,596,222 
Plant in service and held for future use27,370,296 25,860,950 
Accumulated depreciation and amortization(9,012,021)(9,027,426)
Net18,358,275 16,833,524 
Construction work in progress1,649,542 1,592,659 
Palo Verde sale leaseback, net of accumulated depreciation32,035 82,556 
Intangible assets, net of accumulated amortization575,978 591,310 
Nuclear fuel, net of accumulated amortization104,274 97,850 
Total property, plant and equipment$20,720,104 $19,197,899 
Schedule of Supplemental Cash Flow Information
The following table summarizes supplemental Pinnacle West cash flow information for each of the last three years (dollars in thousands):
Year Ended December 31,
202520242023
Cash paid during the period for:
Income taxes, net of refunds/credits$22,754 $133,968 $8,788 
Interest, net of amounts capitalized388,540 360,349 310,996 
Significant non-cash investing and financing activities:
Accrued capital expenditures$281,133 $257,494 $206,269 
Dividends accrued but not yet paid110,022 106,592 99,813 
BCE Sale non-cash consideration (Note 22)
— — 28,262 

The following table summarizes supplemental APS cash flow information for each of the last three years (dollars in thousands):
Year Ended December 31,
202520242023
Cash paid during the period for:
Income taxes, net of refunds/credits$53,638 $179,013 $21,734 
Interest, net of amounts capitalized307,520 299,799 267,261 
Significant non-cash investing and financing activities:
Accrued capital expenditures$281,133 $257,494 $206,269 
Dividends accrued but not yet paid110,000 107,200 99,800 
The following table presents the income taxes paid for Pinnacle West and APS on a retrospective basis (dollars in thousands):
Pinnacle West ConsolidatedAPS Consolidated
 Year Ended December 31,Year Ended December 31,
 202520242023202520242023
Federal$20,894 $112,870 $8,609 $30,207 $156,112 $21,438 
State1,860 128 179 23,431 22,901 296 
Total$22,754 $112,998 $8,788 $53,638 $179,013 $21,734 
    
State income taxes paid (net of refunds) exceed 5 percent of total income taxes paid (net of refunds) in the following jurisdictions (dollars in thousands):
Pinnacle West ConsolidatedAPS Consolidated
 Year Ended December 31,Year Ended December 31,
 202520242023202520242023
Arizona$2,000 $— (a)$— (a)$23,423 $22,788 $— (a)

(a)    Jurisdiction below the threshold for the period presented.