Power platform MN8 Energy, zinc-based battery manufacturer Eos Energy Enterprises, and Google have announced a joint collaboration to deploy an integrated solar and energy storage project in Kanawha County, West Virginia, supplying dispatchable carbon-free electricity to the regional PJM grid.
Owned and operated by MN8, the Mammoth Solar project will combine 86 MW of utility-scale solar generation with two distinct battery storage technologies: a 70 MW/280 MWh lithium-ion system and a 10 MW/100 MWh long-duration energy storage (LDES) system utilizing Eos’ Z3 aqueous zinc-based technology.
Under the agreement, Google will purchase the project’s total energy, capacity, and clean energy attributes to power its regional data centre infrastructure, including a planned facility in West Virginia. The solar component is projected to reach commercial operation in 2028, with the lithium-ion and long-duration storage installations following in 2029 and 2030, respectively.
The deployment represents the first commercial-scale long-duration energy storage installation in West Virginia, utilizing a 10-hour duration zinc battery system designed to extend solar generation availability beyond traditional short-duration storage windows.
Lucia Tian, Director of Advanced Energy Technologies at Google, stated: “At Google, we’re committed to backing solutions that both serve our data center capacity needs and accelerate progress toward cleaner, more affordable energy systems. This collaboration with MN8 and Eos aims to deploy a smart portfolio of round-the-clock technology solutions to help power our digital infrastructure, while creating meaningful economic benefits for West Virginia.”
Jon Yoder, President and CEO of MN8 Energy, noted: “This project reflects what MN8 does best: understanding a customer’s unique energy profile and building a solution around it. Because Google was willing to pair next-generation storage with utility-scale solar, we could engineer proven and emerging technologies into one dispatchable resource – and deliver clean, around-the-clock power where the grid needs it most.”
Nathan Kroeker, Chief Commercial Officer at Eos, added: “The grid needs more from every megawatt of new generation. Our work with Google is focused on deploying American-made long-duration storage where it solves real grid reliability challenges. Z3 extends the value of clean generation across more hours, strengthens the overall portfolio, and delivers more dependable capacity when it’s needed most.”
Constructed on a former coal mine site, the project represents an estimated $350 million capital investment. MN8 projects the facility will generate approximately $4 million in property tax revenue for local schools and county services during its first 20 years of operation, while creating around 200 construction jobs alongside long-term operational roles.
