Battery storage projects in Maine
8 operating battery storage projects in Maine with 239 MW of battery capacity, largest first. From EIA-860M, August 2026.
Largest battery storage projects in Maine
| # | Plant | Battery MW | GWh, 2025 |
|---|---|---|---|
| 1 | Cross Town Energy StorageCumberland County | 175 | −2.0* |
| 2 | Great Lakes Hydro America - MEPenobscot County · Hydro | 20 | 500 |
| 3 | William F Wyman HybridCumberland County · Oil | 17 | 138 |
| 4 | Bonny EagleYork County · Hydro and battery storage | 8.0 | 31.3 |
| 5 | Rumford Falls Hydro FacilityOxford County · Hydro | 8.0 | 212 |
| 6 | Rumford ESSOxford County | 4.9 | −0.3 |
| 7 | Madison ESSSomerset County | 4.9 | −0.5 |
| 8 | Madison BTMSomerset County | 1.5 | −0.3 |
* Fewer than 12 months of 2025 reported, so the total is partial.
Every project with battery storage, solar and wind hybrids included. MW is battery nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources