South Mills Solar, LLC — Plant Summary
- EIA Plant ID
- 61290
- Capacity
- 3 MW
- Primary Fuel
- Solar
- Technology
- Solar Photovoltaic
- Status
- Operating
- Location
- Big Horn, MT
- Operating Since
- 2017
- Generators
- 1
- Operator
- Adapture Renewables, Inc.
- Parent Company
- —
- Annual Generation
- 4,905 MWh
- Capacity Factor
- 18.6%
- Balancing Authority
- NorthWestern Energy (NWMT)
- ISO/RTO
- —
- NERC Region
- WECC
South Mills Solar, LLC
OperatingSolar
Ranked #4 of 9 Solar plants in MT#4248 of 7447 nationally
3 MW Solar operating in Big Horn, MT — NorthWestern Energy (NWMT)
EIAGEMWD
3 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
2017
Operating Since
Location
Coordinates
43.0165, -74.3261
County
Big Horn, MT
Nearby Plants
- Hales Mills Solar, LLCBESS8 MW · 0.3 km
- JohnstownSolar2 MW · 2.6 km
- County Highway Solar 2 (CSG)Solar5 MW · 2.9 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Adapture Renewables, Inc. | Adapture Renewables, Inc. | — |
| Owner(s) | Adapture Renewables, Inc. | — | — |
| Status | Operating | operating | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
South Mills Solar, LLC is a 3 MW solar photovoltaic power plant located in Big Horn County, Montana. The plant began operating in 2017 and has one generator. It is owned and operated by Adapture Renewables, Inc. The facility utilizes single-axis tracking to maximize solar energy capture.
The plant's latest annual generation was 4,905 MWh, resulting in a capacity factor of 18.6%. South Mills Solar is the fourth-largest of nine solar plants in Montana, and ranks 3800 out of 7108 solar plants nationally. The plant is located within the Western Electricity Coordinating Council (WECC) NERC region, and its balancing authority is NorthWestern Energy (NWMT).
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
NorthWestern Energy (NWMT)
Grid Voltage
12.4 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
105 MWh
Latest Month
4.9K MWh
Annual Generation
18.6%
Capacity Factor
Jan 2023 – Dec 2025
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (1)Beta
General
Adapture Renewables Closes $233 Million in Financing from U.S. Bank for Titanium Solar Projects in Illinois and Arkansas
OAKLAND, Calif. - Adapture Renewables, Inc. , a utility-scale solar and energy storage developer, owner, and operator, today announced the...
www.marketscreener.com·2 months ago
Last updated 2026-03-26
View all articles