Mammoth Solar Project Details
MN8 Energy, Eos Energy Enterprises, and Google have officially announced the Mammoth Solar project located in Kanawha County, West Virginia. This ambitious initiative combines 86MW of solar generation with a hybrid storage approach, featuring 10MW/100MWh of Eos’ Z3 zinc-based long-duration energy storage and 70MW/280MWh of traditional lithium-ion battery energy storage systems. The project is expected to be the first commercial-scale long-duration energy storage deployment in West Virginia. The solar component is slated to operate in 2028, the lithium-ion system in 2029, and the zinc-based LDES system in 2030.
Strategic Partnerships and Defense Applications
Google will purchase the energy, capacity, and clean energy attributes from the Mammoth project. This initiative is part of Google's broader efforts to accelerate long-duration energy storage commercialization as a proud member of the Long Duration Energy Storage Council. It follows a recent announcement where Energy Dome will add a 19MW/190MWh CO2-based LDES system to the grid via a collaboration between Google and the Salt River Project.
Meanwhile, Eos Energy Enterprises continues to expand its strategic footprint. In July 2026, the company received a Golden Dome for America contract from the U.S. Department of Defense to integrate mission-ready long-duration energy storage to support the nation's defense shield requirements.
The integration of zinc-based LDES alongside lithium-ion and solar represents a forward-looking hybrid approach to ensuring grid reliability and meeting corporate clean energy targets.
These combined efforts highlight a growing trend among tech giants and defense agencies to secure resilient, long-duration power supplies through innovative storage chemistries.
This article was assisted by AI analysis. Please refer to the original source for official information.