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Variable Interest Entities - Additional Information (Details) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) trust | Sep. 22, 2025 USD ($) trust | Sep. 30, 2025 USD ($) trust | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) trust | Sep. 30, 2024 USD ($) | Jun. 30, 2025 trust | Dec. 31, 2024 USD ($) | Dec. 31, 1986 trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest |  |  |  | $ 4,306 | $ 4,306 | $ 12,918 | $ 12,918 |  |  |
Regulatory asset |  | $ 1,806,935 |  | 1,806,935 |  | 1,806,935 |  |  | $ 1,810,458 |
Palo Verde VIE acquisition (Note 8) |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Regulatory asset |  | 151,506 |  | 151,506 |  | 151,506 |  |  | 0 |
APS |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest |  |  |  | 4,306 | 4,306 | 12,918 | 12,918 |  |  |
Special use fund |  |  |  |  |  |  |  |  | 34,200 |
Property, plant and equipment, net, reclassified from sale leaseback transaction |  | 47,000 |  | 47,000 |  | 47,000 |  |  |  |
APS | Palo Verde VIE acquisition (Note 8) |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Regulatory asset |  | $ 152,000 |  | 152,000 |  | 152,000 |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest |  |  |  | 1,200 | 0 | 3,600 | 0 |  |  |
Variable Interest Entity | APS |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interest |  |  |  | $ 4,000 | $ 4,000 | $ 13,000 | $ 13,000 |  |  |
Number of VIE lessor trusts | trust |  | 1 | 2 | 1 |  | 1 |  | 2 |  | 3
Number of VIE lessor trusts acquired | trust |  | 2 |  | 2 |  | 2 |  |  |  |
Number of VIE lessor trusts terminated | trust |  | 2 | 2 | 2 |  | 2 |  |  |  |
VIE, acquisition price |  |  | $ 199,000 |  |  |  |  |  |  |
Number of VIE lessor trusts no longer consolidated | trust |  |  | 2 |  |  |  |  |  |  |
Annual lease payments |  |  |  |  |  | $ 9,000 |  |  |  |
Variable Interest Entity | APS | Palo Verde Unit 2 |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 23.90% |  |  |  |
Leased interest percentage |  | 5.20% |  |  |  |  |  |  |  |
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 | Forecast |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Initial loss exposure to the VIEs noncontrolling equity participants during lease extension period | $ 173,000 |  |  |  |  |  |  |  |  |
Variable Interest Entity | Pinnacle West Captive Insurance Cell |  |  |  |  |  |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |  |  |  |  |  |
Special use fund |  | $ 39,000 |  | $ 39,000 |  | $ 39,000 |  |  | $ 34,000 |

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