Google partners with MN8 and Eos on West Virginia solar-plus-storage project to power regional data centers

Google has entered into a partnership with US clean energy developer MN8 Energy and long-duration battery storage firm Eos Energy to develop a solar-plus-storage project in Kanawha County, West Virginia, marking a significant step in the hyperscaler's push to commercialize long-duration energy storage technology.

The agreement supports the development of the Mammoth Solar project, which combines 86MW of utility-scale solar, 10MW/100MWh of Eos' Z3 zinc-based long-duration energy storage, and 70MW/280MWh of lithium-ion energy storage. The facility is being constructed on a reclaimed coal mine site in West Virginia, reflecting a broader industry trend of repurposing former industrial land for clean energy infrastructure.

"This project reflects what MN8 does best: understanding a customer's unique energy profile and building a solution around it," said Jon Yoder, president and CEO of MN8 Energy. "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."

The project will deliver power to the PJM Interconnection and support Google's data center operations in the region, including a planned facility in West Virginia. According to the companies, the solar component is expected to reach completion in 2028, with the lithium-ion storage and long-duration storage systems following in 2029 and 2030, respectively. The partners said the multi-technology configuration is designed to match the load profile of data centers, and once completed, it will become the first long-duration storage project in West Virginia.

"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," said Lucia Tian, director of advanced energy technologies at Google. "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."

Under the terms of the deal, Google will purchase the project's energy, capacity, and clean energy attributes. The company said the agreement forms part of its broader strategy to commercialize long-duration electricity storage (LDES) technology, following its earlier partnership with Italian LDES firm Energy Dome, whose first joint project is expected to come online in 2028.

The deal also represents the first joint project under the previously announced MN8-Eos Master Supply Agreement, signed in October of last year, which aims to deploy up to 750MWh of LDES systems across renewable energy projects throughout the United States.

"The grid needs more from every megawatt of new generation," said Nathan Kroeker, chief commercial officer at Eos. "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."

Eos, headquartered in Edison, New Jersey, is a battery energy storage system manufacturer specializing in zinc-based technology. Its flagship Znyth storage system is designed for four to 16 hours of duration with a 25-year total lifespan, and the company said it has several active commercial deployments across the US. MN8 Energy is an independent renewable and battery storage developer with approximately 4GW of operational and under-construction solar projects, as well as around 1.1GWh of battery storage. Earlier this year, MN8 signed an 80MW power purchase agreement with Meta tied to a solar project in Juniata County, Pennsylvania.

The collaboration underscores how major technology companies are increasingly turning to hybrid generation and storage solutions to meet the round-the-clock power demands of their growing digital infrastructure, while also accelerating the deployment of emerging LDES technologies that could play a critical role in grid reliability in the years ahead.