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Commitments and Contingencies (Details) $ in Thousands |  |  |  |  |  |  |  | 6 Months Ended | 136 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2024 USD ($) | Jan. 01, 2024 USD ($) trust | Oct. 31, 2023 claim | Jan. 17, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jul. 03, 2018 | Aug. 18, 2014 USD ($) | Jun. 30, 2024 USD ($) trust MW | Oct. 31, 2022 claim timePeriod | Apr. 18, 2023 USD ($)
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Production tax credit guarantees |  |  |  |  |  |  |  | $ 30,000 |  |
Kūpono Solar |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Non recourse construction financing agreement |  |  |  |  |  |  |  |  |  | $ 140,000
Kūpono Solar |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Project plant capacity (in MW's) | MW |  |  |  |  |  |  |  | 42 |  |
Asset purchase agreement |  |  |  |  |  |  |  | 20 years |  |
APS |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum insurance against public liability per occurrence for a nuclear incident (up to) |  | $ 16,300,000 |  |  |  |  |  |  |  |
Maximum available nuclear liability insurance (up to) |  | 500,000 |  |  |  |  |  |  |  |
Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program |  | 15,800,000 |  |  |  |  |  |  |  |
Maximum retrospective premium assessment per reactor for each nuclear liability incident |  | 165,900 |  |  |  |  |  |  |  |
Annual limit per incident with respect to maximum retrospective premium assessment |  | $ 24,700 |  |  |  |  |  |  |  |
Number of VIE lessor trusts | trust |  | 3 |  |  |  |  |  | 3 |  |
Maximum potential retrospective assessment per incident of APS |  | $ 144,900 |  |  |  |  |  |  |  |
Annual payment limitation with respect to maximum potential retrospective premium assessment |  | $ 21,600 |  |  |  |  |  |  |  |
Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde |  |  |  |  |  |  |  | $ 2,800,000 |  |
Maximum amount that could be incurred under retrospective assessment of NEIL policies |  |  |  |  |  |  |  | 23,100 |  |
Collateral assurance provided based on rating triggers |  |  |  |  |  |  |  | $ 64,100 |  |
Period to provide collateral assurance based on rating triggers |  |  |  |  |  |  |  | 20 days |  |
Increase in contractual obligations |  |  |  |  |  |  |  | $ 1,500,000 |  |
APS | Surety Bonds Expiring in 2025 |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Surety bonds expiring, amount |  |  |  |  |  |  |  | 20,000 |  |
APS | Letter of Credit |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  | 27,000 |  |
APS | Contaminated groundwater wells |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Costs related to investigation and study under Superfund site |  |  |  |  |  |  |  | 3,000 |  |
Costs related to oversight and remedial investigation of superfund site |  |  |  | $ 1,700 |  |  |  |  |  |
APS | Contaminated groundwater wells | Pending Litigation |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  | $ 20,700 |  |  |  |  |
NTEC | Four Corners |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Asset purchase agreement, option to purchase, ownership interest, percentage |  |  |  |  |  | 7.00% |  |  |  |
Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Amount awarded from other party | $ 18,390 |  |  |  |  |  | $ 18,460 | 138,200 |  |
Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste | APS |  |  |  |  |  |  |  |  |  |
Schedule of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of claims submitted | claim |  |  | 10 |  |  |  |  |  | 9 |
Gain contingency, number of settlement agreement time periods | timePeriod |  |  |  |  |  |  |  |  | 9 |
Amount awarded from other party |  |  |  |  |  |  | $ 5,400 | $ 40,200 |  |

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