Google partners with MN8 Energy and Eos on West Virginia solar-plus-LDES project

September 3, 2026

Announced 2 September, the Mammoth Solar project in Kanawha County, West Virginia combines 86MW of solar, 10MW/100MWh of Eos’ Z3 zinc-based long-duration energy storage (LDES) solution, and a 70MW/280MWh lithium-ion (Li-ion) battery energy storage system (BESS). Image: MN8 Energy

Renewables developer-operator MN8 Energy, zinc hybrid cathode battery and storage system maker Eos Energy Enterprises, and tech giant Google are backing a multi-technology renewables project on the PJM grid in the US.

Announced 2 September, the Mammoth Solar project in Kanawha County, West Virginia combines 86MW of solar, 10MW/100MWh of Eos’ Z3 zinc-based long-duration energy storage (LDES) solution, and a 70MW/280MWh lithium-ion (Li-ion) battery energy storage system (BESS).

The solar project is expected to reach commercial operation in 2028, with the Li-ion BESS and LDES solution following in 2029 and 2030, respectively.