FlexGen Selected for West Virginia Solar Storage Project
FlexGen will serve as system integrator for MN8 Energy's Mammoth Solar project in Kanawha, West Virginia, which pairs solar with battery storage.
Updated on Nov. 12, 2026 in Energy
FlexGen has been selected as system integrator for MN8 Energy's Mammoth Solar project in Kanawha, West Virginia. The project combines 86MW of utility-scale solar with lithium-ion and zinc-based battery storage.
Why it matters
The project aims to expand round-the-clock clean power for local digital infrastructure in West Virginia. It is the state's first utility-scale zinc-based long-duration energy storage deployment.
The Mammoth Solar project pairs 86MW of utility-scale solar with 70MW/280MWh of lithium-ion storage and 10MW/100MWh of Eos zinc hybrid battery storage. The source does not provide a timeline for when the system will begin operating.
The players
MN8 Energy
MN8 Energy is the owner and operator of the Mammoth Solar project in Kanawha, West Virginia.
FlexGen
FlexGen is an energy storage company that serves as system integrator and supplies its HybridOS software for the project.
Eos Energy Enterprises
Eos Energy Enterprises is a battery manufacturer whose zinc hybrid cathode storage is used at the Mammoth Solar project.
The details
FlexGen will provide its HybridOS energy management software to balance control, analytics and design flexibility across the project's short- and long-duration storage. The project is owned and operated by MN8 Energy and is intended to combine solar generation with storage that supplies power beyond daylight hours.
Timeline
- November 11, 2026: FlexGen's selection as system integrator was announced.
The Tech Race
The project extends the use of Eos zinc hybrid cathode long-duration storage into West Virginia, where it is the state's first utility-scale zinc-based deployment. It pairs that chemistry with lithium-ion batteries to test how short- and long-duration storage can work together at one site.
Round-the-clock clean power from storage paired with solar could improve the reliability of electricity supplied to local digital infrastructure in Kanawha. The project's long-duration zinc storage is a new technology for West Virginia, so its performance will be a practical test for future grid-scale deployments.
The takeaway
Storage paired with solar is being built to deliver power when the sun is not shining. Watching how the Mammoth Solar project performs could show how long-duration batteries fit into the state's energy mix.
Further reading
Explore more Energy coverage on how storage projects like this are being built across West Virginia.
