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The project is being developed by MN8 and will include 100 MWh of long-duration Eos Energy Enterprises zinc-based storage alongside lithium-ion batteries.

Published Sept. 8, 2026

Eos Energy Enterprises' zinc battery factory. The Mammoth Solar project in West Virginia will include 86 MW of solar, 70 MW/280 MWh of lithium-ion energy storage and 10 MW/100 MWh of zinc-based long-duration energy storage developed by Eos, Google announced Sep. 2, 2026.