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Regulatory Matters - Retail Rate Case Filing (Details) $ in Thousands | Feb. 22, 2024 USD ($) | Jan. 25, 2024 USD ($) $ / MWh | Jun. 14, 2023 USD ($) | Dec. 17, 2021 USD ($) | Nov. 02, 2021 USD ($) | Mar. 06, 2023
--- | --- | --- | --- | --- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Revenue increase (decrease) | $ 491,700 | $ 523,100 |  |  |  |
ACC |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Recommended return on equity, percentage | 9.55% | 9.55% |  |  |  |
Increment of fair value rate, percentage | 0.25% | 0.25% |  |  |  |
ACC | Coal Community Transition Plan | Navajo Nation, Hopi Tribe |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory matters, amounts recoverable by rates |  |  |  |  | $ 1,000 |
ACC | Coal Community Transition Plan | Navajo Nation |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory matters, amounts recoverable by rates |  |  |  |  | 10,000 |
ACC | Coal Community Transition Plan | Navajo Nation, Hopi Reservation |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory matters, amounts recoverable by rates |  |  |  |  | 1,250 |
ACC | Coal Community Transition Plan | Navajo County Communities |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory matters, amounts recoverable by rates |  |  |  |  | 500 |
ACC | Coal Community Transition Plan | Navajo Nation, Electrification Projects |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  | 1,500 |
ACC | Coal Community Transition Plan | Navajo County Communities, CCT and Economic Development |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  | 1,100 |
ACC | Coal Community Transition Plan | Navajo Nation, Hopi Tribe for CCT and Economic Development |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  | $ 1,250 |
ACC | Arizona Public Service Company |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Regulatory matters, no of basis penalty point |  |  |  |  | 0.0020 | 0.0020
Reversal of basis point penalty |  |  | 0.0020 |  |  |
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Recommended return on equity, percentage |  |  |  | 8.90% | 8.70% |
Effective fair value percentage | 4.39% | 4.36% |  |  |  |
Prepaid pension asset rate (in percent) |  | 5.00% |  |  |  |
Pension and otherpost retirement and post employment benefit plans (in percent) |  | 5.35% |  |  |  |
Retention of REAC |  | $ 1,900 |  |  |  |
Transfer to LFCR |  | $ 27,100 |  |  |  |
Base fuel rate (in dollars per kWh) | $ / MWh |  | 0.006 |  |  |  |
Increases in annual revenue | $ 253,400 |  |  |  |  |
Increase to the typical residential customer’s bill (in percent) | 8.00% |  |  |  |  |
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation, Hopi Tribe |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount not recoverable |  |  |  |  | $ 215,500 |
Amount funded by shareholders |  |  |  |  | $ 1,000 |
Amount funded by shareholders, term |  |  |  |  | 60 days |
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  | $ 10,000 |
Amount funded by shareholders, term |  |  |  |  | 3 years |
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo County Communities, Cholla Power Plant Closure |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  | $ 500 |
Amount funded by shareholders, term |  |  |  |  | 60 days |
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation, Hopi Reservation |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  | $ 1,250 |
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation Reservation |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Revenue increase (decrease) |  |  |  |  | $ (4,800) |
Recommended return on equity, percentage |  |  | 8.70% |  |  |
Disallowance of plant investments |  |  |  | $ 215,500 |  |
Requested reversal of rate adjustment |  |  | $ 215,500 |  |  |
Lost revenue recovery |  |  | $ 59,600 |  |  |

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