Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | South Texas Project | Colorado Bend II |
|---|---|---|
| Capacity | 2,708.6 MW | 1,230.3 MW |
| Technology | Nuclear | Natural Gas Fired Combined Cycle |
| Operator | STP Nuclear Operating Co | Constellation Power, Inc |
| Operating units | 2 | 3 |
| Latest 12-month generation | 20.25 TWh | 6.75 TWh |
| Latest complete-year capacity factor | 91.8% (2025) | 56.3% (2025) |
| National technology rank | #5 of 54 | #54 of 538 |
| Latest EIA report | 2026-06 | 2026-06 |