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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

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