Arizona utility Tucson Electric Power (TEP) plans to build its second 200-MW battery energy storage system (BESS) in southeast Tucson. The Roadrunner Reserve II will be built next to a southeast-side TEP substation and will store 800 MWh of electricity, enough to serve approximately 42,000 homes for four hours when running at full capacity. The system will complement TEP’s Roadrunner reserve BESS project, which is currently under construction. TEP plans to charge both batteries with grid energy in the morning and afternoon and dispatch it later in the day during periods of high demand.

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