Battery storage projects in Maine
Maine has 8 operating battery storage projects with 0.2 GW of capacity. 1 came online in 2025.
- Operating8
Under 50 MW50–249 MW250 MW and up
Updated monthly. Last updated November 2026.
The largest battery storage projects in Maine
Operating, by capacity
| # | Battery storage project | Year online | Capacity |
|---|---|---|---|
| 1 | Cross Town Energy Storage | 2025 | 175 MW |
| 2 | Great Lakes Hydro America - ME | 2020 | 20 MW |
| 3 | William F Wyman Hybrid | 2016 | 17 MW |
| 4 | Rumford Falls Hydro Facility | 2023 | 8 MW |
| 5 | Bonny Eagle | 2023 | 8 MW |
| 6 | Rumford ESS | 2021 | 5 MW |
| 7 | Madison ESS | 2019 | 5 MW |
| 8 | Madison BTM | 2020 | 2 MW |
Battery storage projects that came online most recently in Maine
Newest first
| # | Battery storage project | Year online | Capacity |
|---|---|---|---|
| 1 | Cross Town Energy Storage | 2025 | 175 MW |
| 2 | Rumford Falls Hydro Facility | 2023 | 8 MW |
| 3 | Bonny Eagle | 2023 | 8 MW |
| 4 | Rumford ESS | 2021 | 5 MW |
| 5 | Great Lakes Hydro America - ME | 2020 | 20 MW |
| 6 | Madison BTM | 2020 | 2 MW |
| 7 | Madison ESS | 2019 | 5 MW |
| 8 | William F Wyman Hybrid | 2016 | 17 MW |
The developer behind each project is on paid plans. See plans
How Cleanview tracks battery storage projects
Operating battery storage projects come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.
Questions about battery storage projects in Maine
- How many battery storage projects are in Maine?
- Maine has 8 operating utility-scale battery storage projects with 0.2 GW of capacity, according to the EIA's monthly survey of power plants.
- What is the largest battery storage project in Maine?
- Cross Town Energy Storage in Cumberland County, Maine is the largest, at 175 MW. It came online in 2025.
- How many battery storage projects were built in Maine in 2025?
- 1 battery storage project came online in Maine in 2025, with 175 MW of capacity.
- Who is developing battery storage projects in Maine?
- Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.
More energy trackers for Maine
Battery storage projects in other states
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