Regulatory Matters - Four Corners, Cholla and Navajo Plant (Details) - APS - USD ($) $ in Millions |
Mar. 31, 2025 |
Aug. 02, 2021 |
|---|---|---|
| Navajo Nation, Economic Development Organization | Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | ||
| Acquisition | ||
| Disallowance of annual amortization percentage | 15.00% | |
| Retired power plant costs | ||
| Acquisition | ||
| Net book value | $ 27.0 | |
| Navajo Plant | ||
| Acquisition | ||
| Net book value | 31.0 | |
| Navajo Plant, Coal Reclamation Regulatory Asset | ||
| Acquisition | ||
| Net book value | $ 5.7 |