The expansion adds 25 MWh of storage to the existing 35 MWh order for an overall project size of 60 MWh to enhance grid resiliency for the Viejas Band of Kumeyaay Indians, the company said.

Eos Energy (EOSE) said the Viejas Enterprise Microgrid installation will include a hybrid of the company's Gen 2.3 systems, which already have been delivered, and the new Eos Z3 Cubes.

Indian Energy, a Native American-owned microgrid developer, and Maada'oozh, a Native American-owned microgrid operations and maintenance provider, worked in partnership with the California Energy Commission to select the Eos Z3 technology for the Viejas Enterprise Microgrid.