The Energy Storage Group's partner ESS has been selected to deploy a 5-MW/50-MWh iron-flow battery by an Arizona Utility. Salt River Project (SRP) selected ESS Tech at its Copper Crossing Energy & Research Center in Florence, AZ—part of SRP’s long-duration storage pilot portfolio and backed by a 10-year energy-storage agreement. The system, targeted for completion by late 2027, uses abundant materials (iron, salt, water) to deliver 10-hour discharge for renewable integration and grid reliability in the Phoenix area. ESS's technology uses over 90% domestic materials.

ESG’s partnership with ESS began in 2017 through the ARPA-E CHARGES, a program designed to help early-stage energy technologies scale.

Read more about ESG's partnership with ESS.

Read more about this project.