Stillwater Wind, LLC
Stillwater County, Montana · EIA plant ID 61858 · Operator: Pattern Operators LP
Nameplate80MWSummer 80 MW
Generators1in service
Net generation278GWh12 mo to Aug 2026
Capacity factor40%wind units, summer MW
Heat rate—thermal plants only
First online2018
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) |
|---|---|---|---|
| 2018 | 70.1 | 39.7% | — |
| 2019 | 257.5 | 36.9% | — |
| 2020 | 307.3 | 43.9% | — |
| 2021 | 260.1 | 37.3% | — |
| 2022 | 302.6 | 43.3% | — |
| 2023 | 256.7 | 36.8% | — |
| 2024 | 274.8 | 39.3% | — |
| 2025 | 252.7 | 36.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| WT | Onshore Wind Turbine | WT | 79.7 | 79.7 | Oct 2018 | Operating | — | siemens SWT-2.3-108 |
Owner / operator
Operator: Pattern Operators LP. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Pattern Operators LP | 100.0% | 80 MW |
Nearby plants
Within 80 km.
| Beaver Creek Wind Facility | 248 MW | 10.1 km |
| Big Timber Wind Farm | 25 MW | 13.4 km |
| River Bend Solar, LLC | 2 MW | 19.3 km |
| Musselshell Wind Project | 10 MW | 45.5 km |
| Musselshell Wind Project Two LLC | 10 MW | 45.5 km |
| Two Dot Wind Broadview East LLC | 2 MW | 58.1 km |