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Walnut Wind Farm — Plant Summary

EIA Plant ID: 56811
Capacity: 165.2 MW
Primary Fuel: Wind
Technology: Onshore Wind Turbine
Status: Operating
Location: Pottawattamie, IA
Operating Since: 2008
Generators: 1
Operator: MidAmerican Energy Co
Parent Company: Berkshire Hathaway
Annual Generation: 584,078 MWh
Capacity Factor: 40.3%
Balancing Authority: Midcontinent Independent Transmission System Operator, Inc..
ISO/RTO: MISO
NERC Region: MRO

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Walnut Wind Farm

OperatingWindGEM: retired

Ranked #35 of 122 Wind plants in IA#440 of 1442 nationally

165.2 MW Wind operating in Pottawattamie, IA — Midcontinent Independent Transmission System Operator, Inc..

EIAGEMWD

165.2 MW

Nameplate Capacity

1

Generators

unit

Onshore Wind Turbine

Technology

2008

Operating Since

Location

Coordinates

26.1913, -97.4872

County

Pottawattamie, IA

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Ownership & Operator

Field	EIA	GEM	Wikidata
Operator	MidAmerican Energy Co	EDF Renewables	—
Owner(s)	MidAmerican Energy Co	Berkshire Hathaway	—
Status	Operating	retired	—

Ownership Chain

About

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 Wikipedia

Walnut 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

Wikipedia EIA Plant Profile Wikidata Global Energy Monitor

Engineering & Generators

Grid Context

NERC Region

MRO

Balancing Authority

Midcontinent Independent Transmission System Operator, Inc..

Grid Voltage

161 kV

Regulatory Status

RE

Entity Type

Investor-Owned Utility

Sector

Electric Utility

Generation

51.4K MWh

Latest Month

584.1K MWh

Annual Generation

40.3%

Capacity Factor

Jan 2022 – Dec 2024

Financial DataBeta

Source: FERC Form 1HIGH

$1,938/kW

Installed Cost

MidAmerican Energy Company

Reporting Utility

Cumulative Installed Cost

Per-Unit Cost Trends

Pricing & Market Data

HIGH confidence

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

News & Articles (8)Beta

Hazards·wildfire

Red Flag Warning: Monona; Harrison; Shelby; Pottawattamie; Mills; Montgomery; Fremont; Page; Knox; Cedar; Thurston; An

Red Flag Warning issued March 21 at 1:04PM CDT until March 22 at 4:00AM CDT by NWS Omaha/Valley NE

Red Flag Warning (hazard)

NWS Omaha/Valley NE·5 days ago

Surge Announces Former Berkshire Hathaway Energy Executive Mr. Richard Weech Joins the Board as an Independent Director

Surge Announces Former Berkshire Hathaway Energy Executive Mr. Richard Weech Joins the Board as an Independent Director

West Vancouver, British Columbia--(Newsfile Corp. - March 17, 2026) - Surge Battery Metals Inc. TSXV:NILI (OTCQX: NILIF) (FSE: DJ5) (the...

TradingView·1 weeks ago

Powin Selected by BHE Renewables, a Berkshire Hathaway Energy business, for one of the World’s Largest Solar and Storage Microgrids

Powin Selected by BHE Renewables, a Berkshire Hathaway Energy business, for one of the World’s Largest Solar and Storage Microgrids

Powin, a global leader in energy storage solutions, will partner with BHE Renewables as the energy storage solutions provider for one of the...

Business Wire·1 years ago

Berkshire Hathaway IPP secures energy storage offtake agreements with California community electricity provider

Berkshire Hathaway IPP secures energy storage offtake agreements with California community electricity provider

BHE Renewables (BHER) has secured Power Purchase Agreements (PPAs) with California community electricity provider Clean Power Alliance (CPA).

Energy-Storage.News·1 years ago

Last updated 2026-03-21

View all 8 articles

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EIA Wikidata GEM