Lake Mills
Winnebago County, Iowa · EIA plant ID 1154 · Operator: City of Lake Mills
×4 MW oil retired since 2020 (latest Oct 2020)
Nameplate18MWSummer 18 MW
Generators4in service
Net generation0GWh12 mo to Dec 2025
Capacity factor0%gas/coal/oil units, summer MW
Heat rate10,434Btu/kWhfossil units, electric fuel, HHV
First online1962Runs as rarely runs
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 1.3 | 0.8% | 8,451 |
| 2002 | 0.5 | 0.3% | 10,869 |
| 2003 | 0.8 | 0.5% | 9,039 |
| 2004 | 0.9 | 0.6% | 9,238 |
| 2005 | 0.4 | 0.2% | 9,296 |
| 2006 | 0.5 | 0.3% | 8,413 |
| 2007 | 1 | 0.6% | 8,175 |
| 2008 | 0 | 0.0% | 9,765 |
| 2009 | 0.1 | 0.0% | 10,338 |
| 2010 | 0.1 | 0.1% | 10,466 |
| 2011 | 0.1 | 0.1% | 10,423 |
| 2012 | 0.1 | 0.1% | 9,551 |
| 2013 | 0.1 | 0.0% | 10,538 |
| 2014 | 0.1 | 0.0% | 10,538 |
| 2015 | 0.1 | 0.1% | 10,986 |
| 2016 | 0.2 | 0.1% | 9,591 |
| 2017 | 0.1 | 0.1% | 9,525 |
| 2018 | 0.1 | 0.1% | 8,602 |
| 2019 | 0.2 | 0.1% | 9,870 |
| 2020 | 0.1 | 0.1% | 25,093 |
| 2021 | 0.1 | 0.1% | — |
| 2022 | 0.1 | 0.1% | 9,986 |
| 2023 | 0 | 0.0% | 8,438 |
| 2024 | 0 | 0.0% | 7,737 |
| 2025 | 0.1 | 0.1% | 10,434 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 4 | Petroleum Liquids | IC | 1.3 | 1.3 | Nov 1962 | Operating | — | coming soon |
| 6 | Petroleum Liquids | IC | 5.7 | 5.7 | Mar 1979 | Operating | — | coming soon |
| 7 | Petroleum Liquids | IC | 7.6 | 7.6 | Jun 1999 | Operating | — | coming soon |
| 8 | Petroleum Liquids | IC | 3.1 | 3.1 | Sep 2022 | Operating | — | coming soon |
| 1A | Petroleum Liquids | IC | 3 | 3 | Jan 1969 | Retired Oct 2020 | — | coming soon |
| 5 | Petroleum Liquids | IC | 0.9 | 0.9 | Jan 1956 | Retired Oct 2020 | — | coming soon |
Owner / operator
Operator: City of Lake Mills. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Lake Mills | 100.0% | 18 MW |
Nearby plants
Within 80 km.
| Lake Mills Gas Recovery | 4 MW | 4 km |
| Top of Iowa Windfarm | 80 MW | 10.1 km |
| Forest City Solar | 3 MW | 17.5 km |
| POET Biorefining-Hanlontown, LLC | 4 MW | 17.9 km |
| Top of Iowa Windfarm III | 30 MW | 18.2 km |
| Forest City Light Plant | 22 MW | 19 km |