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v3.26.1

Variable Interest Entities - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2026 USD ($) trust | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) trust | Jun. 30, 2025 USD ($) | Dec. 31, 2026 USD ($) | Dec. 31, 2025 USD ($) | Sep. 30, 2025 trust | Dec. 31, 1986 trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest | $ 2,193 | $ 4,306 | $ 4,387 | $ 8,612 |  |  |  |
APS |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest | 2,193 | 4,306 | 4,387 | 8,612 |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest | 4,100 | 1,700 | 4,400 | 2,400 |  |  |  |
Variable Interest Entity | APS |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest | $ 2,000 | $ 4,000 | $ 4,000 | $ 9,000 |  |  |  |
Number of VIE lessor trusts | trust | 1 |  | 1 |  |  |  |  | 3
Number of VIE lessor trusts acquired | trust |  |  |  |  |  |  | 2 |
Number of VIE lessor trusts terminated | trust |  |  |  |  |  |  | 2 |
Annual lease payments |  |  | $ 9,000 |  |  |  |  |
Variable Interest Entity | APS | Forecast |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Initial loss exposure to the VIEs noncontrolling equity participants during lease extension period |  |  |  |  | $ 177,000 |  |  |
Variable Interest Entity | APS | Maximum |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Lease period (up to) |  |  | 2 years |  |  |  |  |
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period (up to) |  |  | $ 267,000 |  |  |  |  |
Variable Interest Entity | APS | Palo Verde Unit 2 |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Ownership percentage |  |  | 23.90% |  |  |  |  |
Leased interest percentage | 5.20% |  | 5.20% |  |  |  |  |
Variable Interest Entity | Pinnacle West Captive Insurance Cell |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |
Special use fund | $ 46,000 |  | $ 46,000 |  |  | $ 40,000 |  |

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