Top of Iowa Windfarm III
Worth County, Iowa · EIA plant ID 56386 · Operator: Madison Gas & Electric Co
Nameplate30MWSummer 30 MW
Generators1in service
Net generation40GWh12 mo to Dec 2025
Capacity factor15%wind units, summer MW
Heat rate—thermal plants only
First online2008
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), wind 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2008 | 70.9 | 220.4% | — |
| 2009 | 83.3 | 396.4% | — |
| 2010 | 70.4 | 334.8% | — |
| 2011 | 80.6 | 278.9% | — |
| 2012 | 74.1 | 248.2% | — |
| 2013 | 81.4 | 281.7% | — |
| 2014 | 91.8 | 308.2% | — |
| 2015 | 87.5 | 262.8% | — |
| 2016 | 84.4 | 252.8% | — |
| 2017 | 82.6 | 254.8% | — |
| 2018 | 72.2 | 242.5% | — |
| 2019 | 66.8 | 195.4% | — |
| 2020 | 48.8 | 146.3% | — |
| 2021 | 40 | 134.3% | — |
| 2022 | 50.6 | 19.5% | — |
| 2023 | 40.5 | 15.6% | — |
| 2024 | 43.8 | 16.8% | — |
| 2025 | 39.9 | 15.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| TOI3 | Onshore Wind Turbine | WT | 29.7 | 29.7 | Feb 2008 | Operating | — | vestas V82-1.65 |
Owner / operator
Operator: Madison Gas & Electric Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Madison Gas & Electric Co | 100.0% | 30 MW |
Nearby plants
Within 80 km.
| Northern Iowa Windpower II | 80 MW | 1.9 km |
| Roeder Family Wind Farm LLC | 2 MW | 7.6 km |
| Top of Iowa Windfarm | 80 MW | 8.2 km |
| Windwalkers LLC | 2 MW | 8.5 km |
| POET Biorefining-Hanlontown, LLC | 4 MW | 9.5 km |
| Lime Creek | 90 MW | 15.5 km |