Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Hidalgo Energy Center | Gregory Power Plant |
|---|---|---|
| Capacity | 551.3 MW | 469.8 MW |
| Technology | Natural Gas Fired Combined Cycle | Natural Gas Fired Combined Cycle |
| Operator | Calpine Corp - Hidalgo | Gregory Power Partners LLC |
| Operating units | 3 | 3 |
| Latest 12-month generation | 2.85 TWh | 681.9 GWh |
| Latest complete-year capacity factor | 56.4% (2025) | 15.5% (2025) |
| National technology rank | #286 of 538 | #315 of 538 |
| Latest EIA report | 2026-06 | 2026-06 |