Lake Mills
Lake Mills is a 18 MW oil-fired power plant in Winnebago County, Iowa, operated by City of Lake Mills - (IA). EIA-860M lists 4 generating units here, inside MISO. Its units entered service between 1962 and 2022.
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
- 17.7 MW
- 17.7 MW net summer
- Generating units
- 4
- In service
- 1962–2022
- EIA plant ID
- 1154
Where it is
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- County
- Winnebago County, Iowa
- Coordinates
- 43.4172, -93.5322
- Balancing authority
- MISO
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- City of Lake Mills - (IA)
- Primary energy source
- Petroleum
- Technologies
- Petroleum Liquids
- Status
- Operating
Lake Mills: FAQ
- Where is Lake Mills?
- In Winnebago County, Iowa (IA). 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 Lake Mills?
- 18 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.
- Who owns Lake Mills?
- EIA-860M names City of Lake Mills - (IA) 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 Lake Mills LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of Lake Mills - (IA) 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 "Lake Mills LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Lake Mills still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.