v3.26.1
Derivative Accounting - Schedule of Derivative Instruments in the Balance Sheet (Details) - Commodity Contracts - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets    
Gross Recognized Derivatives $ 2,012 $ 19,347
Amounts Offset (2,012) (10,965)
Net Recognized Derivatives 0 8,382
Other 5 5
Derivative asset, total 5 8,387
Liabilities    
Gross Recognized Derivatives (80,843) (45,035)
Amounts Offset 2,012 10,965
Net Recognized Derivatives (78,831) (34,070)
Other (2,296) (2,566)
Derivative liability, total (81,127) (36,636)
Assets and Liabilities    
Gross Recognized Derivatives (78,831) (25,688)
Amounts Offset 0 0
Net Recognized Derivatives (78,831) (25,688)
Other (2,291) (2,561)
Amounts  Reported on  Balance Sheets (81,122) (28,249)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:AssetsCurrent    
Assets    
Gross Recognized Derivatives 782 12,640
Amounts Offset (782) (9,395)
Net Recognized Derivatives 0 3,245
Other 5 5
Derivative asset, total 5 3,250
Location, Statement of Financial Position, Balance [Axis]: us-gaap:DeferredCreditsAndOtherLiabilities    
Liabilities    
Gross Recognized Derivatives (11,373) (3,065)
Amounts Offset 1,230 1,570
Net Recognized Derivatives (10,143) (1,495)
Other 0 0
Derivative liability, total (10,143) (1,495)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:LiabilitiesCurrent    
Liabilities    
Gross Recognized Derivatives (69,470) (41,970)
Amounts Offset 782 9,395
Net Recognized Derivatives (68,688) (32,575)
Other (2,296) (2,566)
Derivative liability, total (70,984) (35,141)
Location, Statement of Financial Position, Balance [Axis]: pnw:TotalInvestmentsAndOtherAssets    
Assets    
Gross Recognized Derivatives 1,230 6,707
Amounts Offset (1,230) (1,570)
Net Recognized Derivatives 0 5,137
Other 0 0
Derivative asset, total $ 0 $ 5,137