Directory of Power Plants in Maine
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Gardiner | KEI (Maine) Power Management (III) LLC | Gardiner, ME | ISO New England (ISNE) | 4.3 GWh | Jun 1985 | Dec 2024 | Water |
| Gorham Solar 1 (CSG) | CleanCapital Holdings | Gorham, ME | ISO New England (ISNE) | 7.8 GWh | Oct 2023 | Dec 2024 | Solar |
| Gulf Island | Brookfield White Pine Hydro LLC | Lewiston, ME | ISO New England (ISNE) | 136.3 GWh | Dec 1925 | Dec 2024 | Water |
| Great Lakes Hydro America - ME | Great Lakes Hydro America LLC | Millinocket, ME | ISO New England (ISNE) | 570.9 GWh | Jun 1917 | Dec 2024 | Water |
| Georges River Energy | Robbins Lumber Inc | Searsmont, ME | ISO New England (ISNE) | 51.9 GWh | Nov 2018 | Dec 2024 | Wood/Wood Waste Solids |
Browse Power Plants By Maine Counties
Figures are based on September 2025 generation numbers.| County | State Rank | Active Plants | Sep 2025 Generation |
|---|---|---|---|
| Penobscot County, ME | # 1 | 47 | 3.8 TWh |
| Cumberland County, ME | # 2 | 22 | 3.3 TWh |
| Oxford County, ME | # 3 | 21 | 1.7 TWh |
| Somerset County, ME | # 4 | 36 | 1.6 TWh |
| Androscoggin County, ME | # 5 | 29 | 758.2 GWh |
| Franklin County, ME | # 6 | 16 | 750.4 GWh |
| Washington County, ME | # 7 | 9 | 696.9 GWh |
| Aroostook County, ME | # 8 | 32 | 625.5 GWh |
| County | State Rank | Active Plants | Sep 2025 Generation |
|---|---|---|---|
| Piscataquis County, ME | # 9 | 4 | 526.8 GWh |
| Hancock County, ME | # 10 | 14 | 479.2 GWh |
| Waldo County, ME | # 11 | 9 | 272.1 GWh |
| York County, ME | # 12 | 22 | 262.0 GWh |
| Kennebec County, ME | # 13 | 27 | 198.0 GWh |
| Sagadahoc County, ME | # 14 | 5 | 63.5 GWh |
| Knox County, ME | # 15 | 5 | 22.0 GWh |
| Lincoln County, ME | # 16 | 4 | 18.4 GWh |