Google backs 86 MW solar project

Google, MN8 Energy and Eos Energy Enterprises said on September 2 they will develop a clean-energy project in West Virginia that combines utility-scale solar with two types of battery storage to supply additional capacity to the PJM grid. The companies said the project will include 86 megawatts of solar generation, 70 MW/280 megawatt-hours of lithium-ion storage and 10 MW/100 MWh of Eos’ zinc-based long-duration storage. (blog.google) Google said the project is intended to increase round-the-clock clean power available for local digital infrastructure, including a planned Google facility in West Virginia. (investors.eose.com) MN8 will own and operate the project. ### Why are three companies involved instead of one developer? (mn8.com) MN8 Energy said it will own and operate the project, making it the developer and asset operator in the partnership. Eos Energy Enterprises said it will provide its Z3 zinc-based long-duration storage system, while Google is backing the project as part of its effort to secure cleaner electricity for data-center growth in the region. Google said the project will add new clean, dispatchable capacity to the grid serving its data centers in the area, including a planned West Virginia site. The company described the battery design as a mix of short-duration lithium-ion systems and long-duration zinc-hybrid batteries intended to extend clean-power availability beyond when solar panels are generating. (blog.google) ### What exactly is being built in West Virginia? The West Virginia project combines three pieces of equipment with different jobs. The 86 MW solar array generates electricity when sunlight is available, the 70 MW lithium-ion battery system is designed for shorter-duration balancing, and the 10 MW/100 MWh Eos system is meant to discharge for longer periods. (investors.eose.com) Eos said its Z3 technology is zinc-based and manufactured in Pennsylvania. Google called the deployment a first-of-its-kind use of those zinc-hybrid batteries in this project structure. (blog.google) ### Why does the battery mix matter? Eos says its battery chemistry is optimized for discharge periods of roughly 4 to 16-plus hours, which differs from conventional lithium-ion systems commonly used for shorter-duration grid services. That gives the project two storage profiles: fast-response lithium-ion capacity and longer-duration zinc-based capacity. Google has been expanding similar clean-energy arrangements around its U.S. data-center footprint. (investors.eose.com) In a separate Minnesota announcement earlier this year, the company said it was adding wind, solar and iron-air battery storage to support grid capacity around a new data center. (blog.google) ### Is this power going directly to a Google data center? The companies said the project will deliver dispatchable power to PJM, the regional transmission grid operator, rather than operate as a behind-the-meter plant dedicated only to one facility. MN8 said the added capacity will serve the grid that supplies Google’s data centers in the region, including the planned West Virginia project. (eose.com) That structure matters because it ties the build to broader grid capacity rather than only on-site generation. Google has said in previous clean-energy announcements that it is using a mix of offtake, investment capital and grid-support arrangements to speed power availability for data-center expansion. (blog.google) ### When does it come online? MN8 said the solar portion is expected to reach commercial operation in 2028. The lithium-ion storage system is expected to follow in 2029, and the long-duration zinc-based storage system in 2030. (businesswire.com) Eos and MN8 had already signed a supply agreement in 2025 covering up to 750 MWh of Eos storage deployments, and the companies said this West Virginia build is part of that broader relationship. The next milestones are the staged commercial-operation dates starting in 2028, with MN8 as owner-operator and Eos supplying the long-duration batteries. (investors.eose.com) (mn8.com) (blog.google)