Battery Storage Projects in Maine
Every operating battery storage project in Maine on EIA-860M for 2026-07: 5 plants, 11 storage units and 202 MW of nameplate capacity across 4 counties, most of it inside ISO New England.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Plants
- 5
- 11 generating units
- Nameplate capacity
- 202 MW
- Counties
- 4
- Grid operator
- ISO New England
- covers most of these plants
Map of battery storage projects in Maine
Every one of the 5 plants is drawn at the coordinate EIA files for it.
Loading map…
- Battery · 5
List of battery storage projects in Maine
Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.
| Cross Town Energy StorageBatteries | Cross Town Energy Storage LLC | Cumberland | 175 | 1 | 2025 | Operating |
| Bonny Eagle2 technologies | Brookfield White Pine Hydro LLC | York | 15.2 | 7 | 1910 | Operating |
| Rumford ESSBatteries | Agilitas Energy, Inc. | Oxford | 4.9 | 1 | 2021 | Operating |
| Madison ESSBatteries | Agilitas Energy, Inc. | Somerset | 4.9 | 1 | 2019 | Operating |
| Madison BTMBatteries | Agilitas Energy, Inc. | Somerset | 1.5 | 1 | 2020 | Operating |
Largest battery storage projects in Maine
- 1Cross Town Energy StorageCumberland County, Maine175 MW
- 2Bonny EagleYork County, Maine15.2 MW
- 3Rumford ESSOxford County, Maine4.9 MW
- 4Madison ESSSomerset County, Maine4.9 MW
- 5Madison BTMSomerset County, Maine1.5 MW
Battery storage projects by county in Maine
The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.
| County | Plants | Nameplate MW |
|---|---|---|
| Cumberland | 1 | 175 |
| York | 1 | 15.2 |
| Somerset | 2 | 6.4 |
| Oxford | 1 | 4.9 |
Battery Storage Projects in Maine: FAQ
- How many battery storage projects are in Maine?
- 5, with 202 MW of nameplate capacity between them, spread over 4 counties. That is the EIA-860M operating count for 2026-07.
- Is there a map of Maine battery storage projects?
- Yes — the map above. Each dot is one battery storage project, sized by nameplate capacity and placed at the coordinates EIA files for it.
- Which is the largest battery storage project in Maine?
- Cross Town Energy Storage, at 175 MW. The table is sorted largest first, so the rest follow it.
- Is there a battery storage project near me in Maine?
- The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
- Which grid operator runs Maine's battery storage projects?
- Most of them sit inside ISO New England, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.
- How current is this, and what is left out?
- EIA-860M for 2026-07. EIA technology "Batteries" — grid-connected electrochemical storage of 1 MW and above. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.