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Revenue (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following table provides detail of Pinnacle West’s consolidated revenues disaggregated by revenue sources (dollars in thousands):

Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Retail Electric Service
Residential$963,186 $966,557 $2,063,775 $2,057,407 
Non-Residential765,247 721,644 1,944,142 1,792,998 
Wholesale Energy Sales46,333 39,303 89,050 76,428 
Transmission Services for Others44,284 38,705 101,827 93,958 
Other Sources1,691 2,592 12,978 8,716 
Total Operating Revenues$1,820,741 $1,768,801 $4,211,772 $4,029,507 
Schedule of Allowance for Doubtful Accounts
The following table provides a rollforward of Pinnacle West’s allowance for doubtful accounts (dollars in thousands):

Nine Months EndedYear Ended
September 30, 2025December 31, 2024
Balance at beginning of period$24,849 $22,433 
Bad debt expense20,739 35,799 
Actual write-offs(23,721)(33,383)
Balance at end of period$21,867 $24,849