Ivester Wind Farm
Grundy County, Iowa · EIA plant ID 61911 · Operator: MidAmerican Energy Co
Nameplate91MWSummer 90 MW
Generators1in service
Net generation323GWh12 mo to Aug 2026
Capacity factor41%wind units, summer MW
Heat rate—thermal plants only
First online2018
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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) |
|---|---|---|---|
| 2018 | 9.6 | 14.2% | — |
| 2019 | 257 | 32.3% | — |
| 2020 | 300.7 | 37.7% | — |
| 2021 | 322.1 | 40.5% | — |
| 2022 | 364.9 | 46.3% | — |
| 2023 | 321.8 | 40.8% | — |
| 2024 | 340.7 | 43.1% | — |
| 2025 | 328.1 | 41.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| WT1 | Onshore Wind Turbine | WT | 90.8 | 90 | Dec 2018 | Operating | — | siemens SWT-2.625-120 |
Owner / operator
Operator: MidAmerican Energy Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| MidAmerican Energy Co | 100.0% | 91 MW |
Nearby plants
Within 80 km.
| Wellsburg Wind Project | 141 MW | 6.6 km |
| Grundy Center City Light Plant | 9 MW | 14.7 km |
| Vienna Wind Farm | 150 MW | 23.9 km |
| Dike City Power Plant | 2 MW | 29.9 km |
| Alliant SBD 9107 JBS USA | 11 MW | 31.1 km |
| Marshalltown | 189 MW | 32.6 km |