Big Timber Wind Farm
Wind power plant in Sweet Grass County, Montana. 25 MW of nameplate capacity across 1 generator, operated by RWE Clean Energy.
Also known as Big Timber · EIA plant 61155
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 25 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- February 2018First generator online
- Operator
- RWE Clean EnergyEIA operator ID 67192
- Grid
- NWMTBalancing authority NWMT
- Price nodes
- None linkedNo verified ISO node
- Location
- Sweet Grass County, MT45.8554, −109.6492
- EIA plant ID
- 61155EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Big Timber Wind Farm produces
Free · EIA-923Net generation, 2025
73.3 GWh
73,307 MWh, final
Capacity factor, 2025
33.5%
2024: 32.9%
January to July 2026
49.0 GWh
Provisional
Range, 2018 to 2025
65.8–95.1
GWh a year. Low 2018, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | 0 | Not reported | 1 of 12 |
| 2018 | 65,813 | Not reported | 12 of 12 |
| 2019 | 78,830 | 36.0% | 12 of 12 |
| 2020 | 95,098 | 43.3% | 12 of 12 |
| 2021 | 78,868 | 36.0% | 12 of 12 |
| 2022 | 89,477 | 40.9% | 12 of 12 |
| 2023 | 73,180 | 33.4% | 12 of 12 |
| 2024 | 72,169 | 32.9% | 12 of 12 |
| 2025 | 73,307 | 33.5% | 12 of 12 |
| 2026 (provisional, partial year) | 49,007 | 38.5% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| BT-MT | Onshore Wind Turbine | 25.0 | February 2018 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists RWE Clean Energy as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Power plants near Big Timber Wind Farm
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Questions about Big Timber Wind Farm
How much power does Big Timber Wind Farm produce?
Big Timber Wind Farm reported 73,307 MWh (73.3 GWh) of net generation in 2025, a 33.5% capacity factor on 25 MW of nameplate capacity. From January to July 2026 it reported 49.0 GWh, which is provisional.
Where is Big Timber Wind Farm?
Big Timber Wind Farm is in Sweet Grass County, Montana, at 45.8554, −109.6492. It is in the NorthWestern Energy (NWMT) balancing area (NWMT).
Who operates Big Timber Wind Farm?
EIA-860M for August 2026 lists RWE Clean Energy as the operator (EIA operator ID 67192). The operator is not always the owner.
When did Big Timber Wind Farm start operating?
Its first generator began operating in February 2018, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Project names from the USGS U.S. Wind Turbine Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page