Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Castle Gap Solar Hybrid | Greasewood Solar |
|---|---|---|
| Capacity | 189.9 MW | 255 MW |
| Technology | Solar Photovoltaic, Batteries | Solar Photovoltaic |
| Operator | Upton County Solar 2 LLC | Concho Bluff LLC |
| Operating units | 2 | 1 |
| Latest 12-month generation | 350.0 GWh | 424.6 GWh |
| Latest complete-year capacity factor | 23.1% (2025) | 18.3% (2025) |
| National technology rank | #216 of 7,234 | #69 of 7,234 |
| Latest EIA report | 2026-06 | 2026-06 |