Directory of Power Plants in Maine
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Harris Hydro | Brookfield White Pine Hydro LLC | West Forks, ME | ISO New England (ISNE) | 170.4 GWh | Dec 1953 | Dec 2024 | Water |
| Hiram | Brookfield White Pine Hydro LLC | Hiram, ME | ISO New England (ISNE) | 40.2 GWh | Dec 1916 | Dec 2024 | Water |
| Hydro Kennebec Project | Hydro Kennebec LLC | Winslow, ME | ISO New England (ISNE) | 27.0 GWh | Dec 1988 | Dec 2024 | Water |
| Hancock Wind Plant | Onward Energy | T22 MD, ME | ISO New England (ISNE) | 120.8 GWh | Nov 2016 | Aug 2025 | Wind |
| Hartland Solar | Madison Energy Holdings LLC | Hartland, ME | ISO New England (ISNE) | 6.9 GWh | Nov 2021 | Dec 2024 | Solar |
| Harmony Solar (ME) | Maine DG Solar Harmony, LLC | Harmony, ME | ISO New England (ISNE) | 8.9 GWh | Jul 2022 | Dec 2024 | Solar |
Browse Power Plants By Maine Counties
Figures are based on August 2025 generation numbers.| County | State Rank | Active Plants | Aug 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 | 757.9 GWh |
| Franklin County, ME | # 6 | 16 | 753.7 GWh |
| Washington County, ME | # 7 | 9 | 677.4 GWh |
| Aroostook County, ME | # 8 | 32 | 620.5 GWh |
| County | State Rank | Active Plants | Aug 2025 Generation |
|---|---|---|---|
| Piscataquis County, ME | # 9 | 4 | 525.8 GWh |
| Hancock County, ME | # 10 | 14 | 477.9 GWh |
| Waldo County, ME | # 11 | 9 | 271.7 GWh |
| York County, ME | # 12 | 22 | 261.6 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 |