Eos Energy Enterprises (ticker: EOSE) surged 12.2% in pre‑open trading on Monday, marking a sharp rebound from a 52‑week low recorded on Sept. 1. The rally followed a joint announcement with MN8 Energy and Google outlining a $350 million integrated clean‑energy development dubbed the Mammoth Solar project.
The project will be built on a reclaimed coal‑mine site in Kanawha County, West Virginia, and is designed to supply round‑the‑clock power to Google’s data centers via the PJM grid. It combines 86 MW of utility‑scale solar generation with two storage solutions: a 10 MW/100 MWh zinc‑based Z3 long‑duration system from Eos and a 70 MW/280 MWh lithium‑ion battery installation.
Solar output is slated to reach commercial operation in 2028, while the long‑duration storage component is expected to be online by 2030. The deployment represents West Virginia’s first commercial‑scale long‑duration energy storage project and marks Google’s inaugural use of Eos’s domestically manufactured Z3 technology.
Beyond the technical milestones, the development is projected to create roughly 200 construction jobs and generate about $4 million in local property‑tax revenue over its first two decades. The announcement came as broader market indices were largely unchanged, with the S&P 500 flat and the Nasdaq barely moving, underscoring the stock’s move as driven by company‑specific news.
Investors appear to have rewarded the partnership, which aligns Eos’s zinc‑based storage platform with a high‑profile tech customer and a sizable renewable‑energy project, potentially enhancing the company’s growth outlook after a period of price weakness.
