Copper Crossing iron flow battery

ESS Tech · Copper Crossing Energy and Research Center, Florence, AZ · Arizona DEVELOPER HEALTHSTRESS

10-hour iron flow battery pilot for Salt River Project; manufacturing in 2026, delivery targeted for December 2027.

Power

5 MW

Long-duration storage · Demonstration

Storage

50 MWh

10-hour duration

Online

Dec 2027

approximate target

Capital committed

—

closed or awarded

Capital pending

—

conditional or under review

Capital stack

0 SOURCES

No project-level financing disclosed yet.

Who's building it: ESS Tech iron flow battery (5 MW / 50 MWh); EPRI monitoring performance

Salt River Project

Utility pilot

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