Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Limestone | J K Spruce |
|---|---|---|
| Capacity | 1,849.8 MW | 1,488.5 MW |
| Technology | Conventional Steam Coal | Conventional Steam Coal |
| Operator | NRG Texas Power LLC | City of San Antonio - (TX) |
| Operating units | 2 | 2 |
| Latest 12-month generation | 6.75 TWh | 6.19 TWh |
| Latest complete-year capacity factor | 46.4% (2025) | 49.6% (2025) |
| National technology rank | #22 of 206 | #43 of 206 |
| Latest EIA report | 2026-06 | 2026-06 |