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252.5 MW Wind operating in Iowa, IA
252.5 MW
Nameplate Capacity
1
Generators
unit
Onshore Wind Turbine
Technology
2020
Operating Since
Coordinates
41.6845, -92.1779
County
Iowa, IA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | MidAmerican Energy Co | General Electric | — |
| Owner(s) | MidAmerican Energy Co | Berkshire Hathaway | — |
| Status | Operating | operating | — |
Diamond Trail Wind Farm is a 252.5 MW wind power facility located in Iowa County, Iowa. The plant began operating in 2020 and is owned by Berkshire Hathaway and operated by MidAmerican Energy Co. It utilizes a single generator consisting of onshore wind turbines. The facility is connected to the Midcontinent Independent Transmission System Operator, Inc. (MISO) balancing authority within the MRO NERC region. Diamond Trail Wind Farm ranks as the 13th largest wind farm in Iowa out of 54, and 157th nationally out of 734.
The wind farm's turbines have a hub height of 105 meters and a rotor diameter of 136 meters. The turbines were manufactured by Vestas and are model V136-4.3. In its most recent year of operation, Diamond Trail Wind Farm generated 862,903 MWh of electricity, achieving a capacity factor of 39.1%. The installed cost of the facility was $1575.7 per kW, according to FERC data.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
345.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
92.4K MWh
Latest Month
862.9K MWh
Annual Generation
39.1%
Capacity Factor
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Wind · MidAmerican Energy Company · Data from 2020–2024
$1,613/kW
Installed Cost
$8.1/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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Market Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
MINN.HUB
Alt. Hub / Zone
ILLINOIS.HUB
Node Source
OSM spatial match
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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