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310 MW Wind operating in Adair, IA — Midcontinent Independent Transmission System Operator, Inc..
310 MW
Nameplate Capacity
2
Generators
units
Onshore Wind Turbine
Technology
2018
Operating Since
Coordinates
41.4499, -94.3288
County
Adair, IA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | MidAmerican Energy Co | MidAmerican Energy | — |
| Owner(s) | MidAmerican Energy Co | Berkshire Hathaway | — |
| Status | Operating | operating | — |
Arbor Hill Wind Farm is a 310 MW wind power plant located in Adair County, Iowa. The facility began operating in 2018 and is owned by Berkshire Hathaway and operated by MidAmerican Energy Co. The plant utilizes two onshore wind turbines manufactured by Vestas, model V110-2.0, with a rotor diameter of 110 meters and a hub height of 95 meters. Arbor Hill Wind Farm is connected to the Midcontinent Independent Transmission System Operator (MISO) and falls within the MRO NERC region.
The plant's latest annual generation was 1,148,002 MWh, achieving a capacity factor of 42.4%. Arbor Hill Wind Farm is the 7th largest wind farm in Iowa out of 54, and ranks 67th nationally out of 734 wind facilities. The installed cost of the plant was $1525.87 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
119.7K MWh
Latest Month
1.1M MWh
Annual Generation
42.4%
Capacity Factor
Wind · MidAmerican Energy Company · Data from 2018–2024
$1,539/kW
Installed Cost
$6.9/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Point of Interconnection
Nearest Substation
Arbor Hill Substation · 345 kV
Substation Distance
< 10 km
Operator
MidAmerican Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
MEC.ARBORHL1
Pricing Hub
MINN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
Last updated 2026-04-19
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