Umbriel Solar
Polk County, Texas · EIA plant ID 66954 · Operator: Umbriel Solar, LLC
Nameplate150MWSummer 150 MW
Generators1in service
Net generation325GWh12 mo to Aug 2026
Capacity factor25%solar units, summer MW
Heat rate—thermal plants only
First online2023
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2023 | 65.2 | 19.7% | — |
| 2024 | 323.4 | 24.6% | — |
| 2025 | 318.9 | 24.3% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 23001 | Solar Photovoltaic | PV | 150 | 150 | Oct 2023 | Operating | — | coming soon |
Owner / operator
Operator: Umbriel Solar, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Umbriel Solar, LLC | 100.0% | 150 MW |
Nearby plants
Within 80 km.
| Segno Solar Station | — | 13.8 km |
| RC Thomas Hydroelectric Project | 27 MW | 22 km |
| Votaw Solar Station | — | 28 km |
| Longwing Solar | — | 34.1 km |
| Woodville Renewable Power Project | 50 MW | 34.2 km |
| San Jacinto County Peaking Facility | 170 MW | 35.3 km |