Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | South Texas Project | Martin Lake |
|---|---|---|
| Capacity | 2,708.6 MW | 2,379.6 MW |
| Technology | Nuclear | Conventional Steam Coal |
| Operator | STP Nuclear Operating Co | Luminant Generation Company LLC |
| Operating units | 2 | 3 |
| Latest 12-month generation | 20.25 TWh | 9.48 TWh |
| Latest complete-year capacity factor | 91.8% (2025) | 40.9% (2025) |
| National technology rank | #5 of 54 | #14 of 206 |
| Latest EIA report | 2026-06 | 2026-06 |