Directory of Power Plants in Massachusetts
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| 3Colton | Madison Energy Holdings LLC | Millbury, MA | ISO New England (ISNE) | 4.9 GWh | Jun 2023 | Dec 2025 | Solar |
| 376 Nash | Madison Energy Investments LLC | New Bedford, MA | ISO New England (ISNE) | 17.0 MWh | Nov 2024 | Dec 2025 | Solar |
| 301 Chestnut Solar NG | NuGen Capital Management | East Longmeadow, MA | ISO New England (ISNE) | 2.2 GWh | Mar 2017 | Dec 2025 | Solar |
Browse Power Plants By Massachusetts Counties
Figures are based on August 2026 generation numbers.| County | State Rank | Active Plants | Aug 2026 Generation |
|---|---|---|---|
| Berkshire County, MA | # 13 | 46 | 85.8 GWh |
| Franklin County, MA | # 12 | 33 | 172.4 GWh |
| Hampshire County, MA | # 11 | 39 | 226.3 GWh |
| Suffolk County, MA | # 10 | 14 | 427.6 GWh |
| Barnstable County, MA | # 9 | 25 | 531.6 GWh |
| Bristol County, MA | # 8 | 75 | 645.7 GWh |
| Plymouth County, MA | # 7 | 86 | 797.7 GWh |
| County | State Rank | Active Plants | Aug 2026 Generation |
|---|---|---|---|
| Dukes County, MA | # 6 | 7 | 879.6 GWh |
| Hampden County, MA | # 5 | 90 | 1.9 TWh |
| Middlesex County, MA | # 4 | 70 | 1.9 TWh |
| Essex County, MA | # 3 | 41 | 2.1 TWh |
| Worcester County, MA | # 2 | 200 | 4.9 TWh |
| Norfolk County, MA | # 1 | 40 | 5.9 TWh |