Pinnacle West Capital CorpAPS (subsidiary of Pinnacle West) plans to convert retired coal units to natural gas, a capital project that repurposes existing infrastructure to meet growing demand.

Arizona Public Service plans to convert two retired coal-fired units at its Cholla Power Plant to burn natural gas, with construction starting in 2028 and the 380-megawatt facility coming online in 2029. The conversion, which still requires state regulatory approval, would use existing infrastructure to meet growing energy demand in Arizona. The Cholla plant historically operated as a 1.02-gigawatt coal-fired facility jointly owned by APS and PacifiCorp, with its last coal units shutting down in March 2025 under federal Regional Haze Program requirements. APS says the project would require minimal new transmission infrastructure and would connect to an existing natural gas pipeline via a lateral line.
Pinnacle West Capital CorpAPS (subsidiary of Pinnacle West) plans to convert retired coal units to natural gas, a capital project that repurposes existing infrastructure to meet growing demand.