Rattlesnake Flat
Adams County, Washington · EIA plant ID 62936 · Operator: Rattlesnake Flat, LLC
Nameplate144MWSummer 144 MW
Generators1in service
Net generation396GWh12 mo to Aug 2026
Capacity factor31%wind units, summer MW
Heat rate—thermal plants only
First online2020
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) |
|---|---|---|---|
| 2020 | 3.2 | 3.0% | — |
| 2021 | 426.5 | 33.8% | — |
| 2022 | 366.2 | 29.0% | — |
| 2023 | 345.6 | 27.4% | — |
| 2024 | 415.9 | 32.9% | — |
| 2025 | 414.7 | 32.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| RAT | Onshore Wind Turbine | WT | 144 | 144 | Dec 2020 | Operating | — | siemens gamesa SG 2.7-129 |
Owner / operator
Operator: Rattlesnake Flat, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Rattlesnake Flat, LLC | 100.0% | 144 MW |
Nearby plants
Within 80 km.
| Adams Nielson Solar | 19 MW | 4.4 km |
| Lower Monumental | 810 MW | 42 km |
| Russell D Smith | 6 MW | 47.1 km |
| Quincy Chute | retired | 52.6 km |
| Little Goose | 810 MW | 57.2 km |
| Saddle Mountain East Wind Farm | — | 61.6 km |