Marmas Solar CSG
Marmas Solar CSG is a 4 MW solar farm in Sherburne County, Minnesota, operated by Geronimo Power. EIA-860M lists 4 generating units here, inside MISO. Its units entered service in 2018.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 4 MW
- 4 MW net summer
- Generating units
- 4
- In service
- 2018
- EIA plant ID
- 61139
Where it is
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- County
- Sherburne County, Minnesota
- Coordinates
- 45.5561, -94.1171
- Balancing authority
- MISO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Geronimo Power
- Primary energy source
- Solar
- Technologies
- Solar Photovoltaic
- Status
- Operating
Marmas Solar CSG: FAQ
- Where is Marmas Solar CSG?
- In Sherburne County, Minnesota (MN). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Marmas Solar CSG?
- 4 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.
- Who owns Marmas Solar CSG?
- EIA-860M names Geronimo Power as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Marmas Solar CSG LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Geronimo Power here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Marmas Solar CSG LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Marmas Solar CSG still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.