$EOSESep 2, 2026, 11:59 AMAI processed
Google signs offtake for MN8 solar project using Eos Z3 long‑duration storage in West Virginia
AI Summary
MN8, Google and Eos announced the Mammoth Solar project in West Virginia combining 86 MW of utility-scale solar, 70 MW/280 MWh of lithium-ion storage and a 10 MW/100 MWh Eos Z3 zinc-based long-duration storage system; Google will purchase the energy, capacity and clean attributes. The solar is expected online in 2028 with lithium storage in 2029 and the Eos LDES in 2030 — the deal is the first commercial-scale LDES deployment in West Virginia and is pitched to deliver dispatchable, around-the-clock capacity to the PJM grid and Google’s data centers, with MN8 estimating up to $350M capex and ~200 construction jobs.
Positives
- Google committed to purchase energy, capacity and clean attributes from the integrated project (offtake in place)
- Includes first commercial-scale zinc-based long-duration storage (Eos Z3, 10 MW/100 MWh) in West Virginia to extend solar output ~10 hours
- Large integrated portfolio (86 MW solar + 70 MW/280 MWh lithium + LDES) intended to provide dispatchable capacity to PJM
Negatives
- Long development timeline: solar 2028, lithium 2029, long-duration storage not expected until 2030
- LDES capacity is relatively small (10 MW) compared with the 70 MW lithium component, limiting near-term LDES impact
- Project outcomes and economic benefits are contingent on completing construction, interconnection and permitting