Diamond Trail Wind Farm
Iowa County, Iowa · EIA plant ID 63641 · Operator: MidAmerican Energy Co
Nameplate253MWSummer 250 MW
Generators1in service
Net generation843GWh12 mo to Aug 2026
Capacity factor38%wind units, summer MW
Heat rate—thermal plants only
First online2020
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) |
|---|---|---|---|
| 2020 | 45.2 | 24.1% | — |
| 2021 | 807.9 | 36.5% | — |
| 2022 | 958 | 43.7% | — |
| 2023 | 818.3 | 37.4% | — |
| 2024 | 843.4 | 38.4% | — |
| 2025 | 862.9 | 39.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| DTWF | Onshore Wind Turbine | WT | 252.5 | 250 | Dec 2020 | Operating | — | vestas V136-4.2 |
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% | 253 MW |
Nearby plants
Within 80 km.
| ASSC Digester Power Plant | 3 MW | 21.4 km |
| English Farms | 172 MW | 23.3 km |
| Brooklyn City North Plant | 2 MW | 24 km |
| Brooklyn | 2 MW | 24.3 km |
| Amana Society Service Company | 22 MW | 26.2 km |
| North English | 340 MW | 28 km |