Directory of Power Plants in Maine
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Valley Sun Solar | Valley Sun Solar LLC | Grand Isle, ME | ISO New England (ISNE) | 3.1 GWh | Nov 2024 | Dec 2025 | Solar |
Browse Power Plants By Maine Counties
Figures are based on June 2026 generation numbers.| County | State Rank | Active Plants | Jun 2026 Generation |
|---|---|---|---|
| Cumberland County, ME | # 1 | 25 | 4.1 TWh |
| Penobscot County, ME | # 2 | 51 | 2.6 TWh |
| Oxford County, ME | # 3 | 24 | 1.7 TWh |
| Somerset County, ME | # 4 | 38 | 1.6 TWh |
| Washington County, ME | # 5 | 10 | 964.8 GWh |
| Androscoggin County, ME | # 6 | 32 | 764.2 GWh |
| Franklin County, ME | # 7 | 18 | 759.6 GWh |
| Aroostook County, ME | # 8 | 33 | 665.0 GWh |
| County | State Rank | Active Plants | Jun 2026 Generation |
|---|---|---|---|
| Piscataquis County, ME | # 9 | 4 | 501.1 GWh |
| Hancock County, ME | # 10 | 16 | 479.0 GWh |
| York County, ME | # 11 | 26 | 301.2 GWh |
| Waldo County, ME | # 12 | 10 | 282.6 GWh |
| Kennebec County, ME | # 13 | 34 | 209.1 GWh |
| Sagadahoc County, ME | # 14 | 5 | 65.0 GWh |
| Knox County, ME | # 15 | 6 | 22.2 GWh |
| Lincoln County, ME | # 16 | 4 | 21.0 GWh |