Rattlesnake Den
Glasscock County, Texas · EIA plant ID 59943 · Operator: SunEdison LLC
Nameplate207MWSummer 207 MW
Generators1in service
Net generation726GWh12 mo to Aug 2026
Capacity factor40%wind units, summer MW
Heat rate—thermal plants only
First online2015
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), wind 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) |
|---|---|---|---|
| 2015 | 368.5 | 40.3% | — |
| 2016 | 884 | 48.6% | — |
| 2017 | 878.6 | 48.4% | — |
| 2018 | 804 | 44.3% | — |
| 2019 | 718.2 | 39.6% | — |
| 2020 | 688.8 | 37.8% | — |
| 2021 | 685.7 | 37.8% | — |
| 2022 | 641.9 | 35.4% | — |
| 2023 | 491.7 | 27.1% | — |
| 2024 | 735.8 | 40.4% | — |
| 2025 | 689.3 | 38.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Onshore Wind Turbine | WT | 207.2 | 207.2 | Jul 2015 | Operating | — | ge 1.7-100 |
Owner / operator
Operator: SunEdison LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| SunEdison LLC | 100.0% | 207 MW |
Nearby plants
Within 80 km.
| Bearkat | 197 MW | 8.6 km |
| Garden City East BESS | 10 MW | 14 km |
| Bearkat II Wind Energy LLC | — | 17.2 km |
| Lacy Creek Wind Energy Center | 301 MW | 18.5 km |
| Champaign BESS, LLC | — | 27.2 km |
| EC&R Panther Creek Wind Farm II | 116 MW | 28.3 km |