Batteries

Salt River Project, Aypa Power announce new BESS project

The 250 MW/1,000 MWh battery project would be operational by mid-2026. 
Salt River Project, Aypa Power announce new BESS project
(FILE - This photo shows part of a battery energy storage facility that is owned and operated by Eolian L.P. AP Photo/Sam Hodde, File.)

Salt River Project (SRP) and Aypa Power have entered into an agreement to add 250 MW/1,000 MWh of new battery storage to the Arizona grid. 

The Signal Butte energy storage project would be a 250 MW, four-hour BESS located in the Elliot Road Technology Corridor in Mesa, AZ. The project would use lithium-ion technology and be operational by mid-2026. 

Signal Butte was selected from SRP’s 2023 All-Source Request for Proposals process. The project was jointly bid by Eolian, L.P., the original developer of the project; and Aypa Power.

The project would be owned and operated by Aypa Power, who purchased this late-stage battery energy storage project from Eolian, taking over the remaining development and construction required to bring this project into operation.

Once online, SRP will have full dispatch control of the storage system and will decide when to deploy its energy output. The project would typically be charged when energy costs are lowest and be discharged in the early-evening when demand is highest.  

SRP currently has nearly 1,300 MW of batteries and pumped hydro and 2,300 MW of carbon-free resources serving its customers. By the end of 2027, SRP expects nearly half of its generation mix to be carbon-free. 

Tags