Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | South Texas Project | W A Parish |
|---|---|---|
| Capacity | 2,708.6 MW | 4,008.4 MW |
| Technology | Nuclear | Natural Gas Steam Turbine, Natural Gas Fired Combustion Turbine, Conventional Steam Coal |
| Operator | STP Nuclear Operating Co | NRG Texas Power LLC |
| Operating units | 2 | 9 |
| Latest 12-month generation | 20.25 TWh | 14.17 TWh |
| Latest complete-year capacity factor | 91.8% (2025) | 44.4% (2025) |
| National technology rank | #5 of 54 | #6 of 206 |
| Latest EIA report | 2026-06 | 2026-06 |