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APS is planning to convert two units from coal to natural gas at its Cholla Power Plant, located in Joseph City in northeast Arizona, which ceased burning coal in March of 2025. If approved, this conversion could add approximately 380 megawatts (MW) of additional energy, enough power to serve about 61,000 Arizona homes.

The Cholla Power Plant has been part of APS’s generation fleet since 1962. The facility historically operated as a coal‑fired power plant and played a long‑standing role in supporting reliable energy.

Construction on the gas conversion is expected to begin in 2028, with a target in-service date of 2029.