South Mills Solar, LLC
Solar power plant in Big Horn County, Montana. 3 MW of nameplate capacity across 1 generator, operated by Adapture Renewables, Inc..
Also known as South Mills Solar · EIA plant 61290
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 3 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- April 2017First generator online
- Operator
- Adapture Renewables, Inc.EIA operator ID 60496
- Grid
- NWMTBalancing authority NWMT
- Price nodes
- None linkedNo verified ISO node
- Location
- Big Horn County, MT45.7301, −107.6326
- EIA plant ID
- 61290EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power South Mills Solar produces
Free · EIA-923Net generation, 2025
4.91 GWh
4,905 MWh, final
Capacity factor, 2025
18.7%
2024: 21.6%
January to July 2026
3.21 GWh
Provisional
Range, 2018 to 2025
4.3–6.4
GWh a year. Low 2019, high 2021
| 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 | 4,247 | Not reported | 9 of 12 |
| 2018 | 5,800 | 22.1% | 12 of 12 |
| 2019 | 4,338 | 16.5% | 12 of 12 |
| 2020 | 5,558 | 21.1% | 12 of 12 |
| 2021 | 6,388 | 24.3% | 12 of 12 |
| 2022 | 5,859 | 22.3% | 12 of 12 |
| 2023 | 5,924 | 22.5% | 12 of 12 |
| 2024 | 5,697 | 21.6% | 12 of 12 |
| 2025 | 4,905 | 18.7% | 12 of 12 |
| 2026 (provisional, partial year) | 3,206 | 21.0% | 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 |
|---|---|---|---|
| SMSMT | Solar Photovoltaic | 3.0 | April 2017 |
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 Adapture Renewables, Inc. 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 South Mills Solar
More plants operated by Adapture Renewables, Inc.
Questions about South Mills Solar
How much power does South Mills Solar, LLC produce?
South Mills Solar, LLC reported 4,905 MWh (4.91 GWh) of net generation in 2025, a 18.7% capacity factor on 3 MW of nameplate capacity. From January to July 2026 it reported 3.21 GWh, which is provisional.
Where is South Mills Solar, LLC?
South Mills Solar, LLC is in Big Horn County, Montana, at 45.7301, −107.6326. It is in the NorthWestern Energy (NWMT) balancing area (NWMT).
Who operates South Mills Solar, LLC?
EIA-860M for August 2026 lists Adapture Renewables, Inc. as the operator (EIA operator ID 60496). The operator is not always the owner.
When did South Mills Solar, LLC start operating?
Its first generator began operating in April 2017, 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)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page