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165.2 MW Wind operating in Pottawattamie, IA
165.2 MW
Nameplate Capacity
1
Generators
unit
Onshore Wind Turbine
Technology
2008
Operating Since
Coordinates
26.1913, -97.4872
County
Pottawattamie, IA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | MidAmerican Energy Co | EDF Renewables | — |
| Owner(s) | MidAmerican Energy Co | Berkshire Hathaway | — |
| Status | Operating | retired | — |
The 153 megawatt (MW) capacity Walnut Wind Farm is located in Pottawattamie County, Iowa. The project, owned by MidAmerican, represents the fifth wind farm built for the group for a total of 595 MW and began operations on February 19, 2009.
Read more on WikipediaWalnut Wind Farm is a 165.2 MW wind power plant located in Pottawattamie County, Iowa. The plant began operating in 2008 and consists of a single generator utilizing onshore wind turbine technology. The facility is owned by Berkshire Hathaway and operated by MidAmerican Energy Co. It interconnects to the Midcontinent Independent Transmission System Operator (MISO) balancing authority within the MRO NERC region. The plant is ranked 35th out of 54 wind farms in Iowa and 434th out of 734 nationally.
The wind farm utilizes GE Wind turbines, specifically the GE1.62-91.5 model, with a rotor diameter of 91.5 meters and a hub height of 80 meters. In the most recent year of data, the plant generated 584,078 MWh, achieving a capacity factor of 40.3%. Financial data indicates an installed cost of $2261.07 per kW, according to FERC filings.
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
161.0 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.
51.4K MWh
Latest Month
584.1K MWh
Annual Generation
40.3%
Capacity Factor
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Wind · MidAmerican Energy Company · Data from 2015–2024
$1,938/kW
Installed Cost
$8.1/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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Point of Interconnection
Nearest Substation
Teakwood Rd Substation · 161 kV
Substation Distance
< 10 km
Operator
MidAmerican Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
MEC.WALNUT_W1
Pricing Hub
MINN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
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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