Arbor Hill Wind Farm
Adair County, Iowa · EIA plant ID 62132 · Operator: MidAmerican Energy Co
Nameplate310MWSummer 310 MW
Generators2in service
Net generation1,137GWh12 mo to Aug 2026
Capacity factor42%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 | 55.1 | 29.6% | — |
| 2019 | 846.8 | 38.7% | — |
| 2020 | 1,060.5 | 39.6% | — |
| 2021 | 1,120.9 | 41.3% | — |
| 2022 | 1,344.7 | 49.5% | — |
| 2023 | 1,069.3 | 39.4% | — |
| 2024 | 1,128.1 | 41.4% | — |
| 2025 | 1,148 | 42.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Onshore Wind Turbine | WT | 60 | 60 | Feb 2020 | Operating | — | vestas V110-2.0 |
| WT1 | Onshore Wind Turbine | WT | 250 | 250 | Dec 2018 | Operating | — | vestas V110-2.0 |
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% | 310 MW |
Nearby plants
Within 80 km.
| Arbor Hill Solar | 25 MW | 7 km |
| Wind GEM | 2 MW | 9.8 km |
| Gilliam South | 4 MW | 11.6 km |
| Stuart (IA) | 3 MW | 12 km |
| Wolverine | 2 MW | 15.3 km |
| Meadow Ridge | 2 MW | 15.5 km |