Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Berkshire Power | Millennium Power |
|---|---|---|
| Capacity | 289 MW | 427.5 MW |
| Technology | Natural Gas Fired Combined Cycle | Natural Gas Fired Combined Cycle |
| Operator | Berkshire Power Co LLC | Millennium Power Company, LLC |
| Operating units | 2 | 2 |
| Latest 12-month generation | 573.3 GWh | 1.01 TWh |
| Latest complete-year capacity factor | 22.6% (2024) | 22.8% (2025) |
| National technology rank | #316 of 538 | #322 of 538 |
| Latest EIA report | 2024-12 | 2026-04 |