Explore the largest battery storage projects in Maine and see all the utility-scale battery storage projects in Maine on a map.
Last updated: May 2026
On this page, you can explore our real-time database of battery storage projects in Maine. Each month, we track battery storage projects and update our list of the largest battery storage projects in Maine.
As of May 2026, there are 8 utility-scale battery storage projects in Maine, according to Cleanview's project tracker. Their total operating capacity is 239 MW. In 2025, there was 1 battery storage project built in Maine. See also: planned battery storage projects in Maine→
Total Battery Storage Projects
8
Total Capacity
239 MW
Built in 2025
1
Map of battery storage projects in Maine. Marker size reflects capacity — only facilities with reported capacity data are shown.
175 MW
Year Operational: November 2025
Location: Cumberland, Maine
Developer: Plus Power
20 MW
Year Operational: December 2020
Location: Penobscot, Maine
17 MW
Year Operational: December 2016
Location: Cumberland, Maine
8 MW
Year Operational: May 2023
Location: Oxford, Maine
8 MW
Year Operational: April 2023
Location: York, Maine
5 MW
Year Operational: June 2021
Location: Oxford, Maine
5 MW
Year Operational: June 2019
Location: Somerset, Maine
2 MW
Year Operational: January 2020
Location: Somerset, Maine
175 MW
Year Operational: November 2025
Location: Cumberland, Maine
Developer: Plus Power
8 MW
Year Operational: May 2023
Location: Oxford, Maine
8 MW
Year Operational: April 2023
Location: York, Maine
5 MW
Year Operational: June 2021
Location: Oxford, Maine
20 MW
Year Operational: December 2020
Location: Penobscot, Maine
2 MW
Year Operational: January 2020
Location: Somerset, Maine
5 MW
Year Operational: June 2019
Location: Somerset, Maine
17 MW
Year Operational: December 2016
Location: Cumberland, Maine
Cleanview