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Rolling Hills Wind Farm — renewablesinfo.org

Rolling Hills Wind Farm — Plant Summary

EIA Plant ID: 57501
Capacity: 484.2 MW
Primary Fuel: Wind
Technology: Onshore Wind Turbine
Status: Operating
Location: Cass, IA
Operating Since: 2011
Generators: 1
Operator: MidAmerican Energy Co
Parent Company: Berkshire Hathaway
Annual Generation: 1,577,482 MWh
Capacity Factor: 37.2%
Balancing Authority: Midcontinent Independent Transmission System Operator, Inc..
ISO/RTO: MISO
NERC Region: MRO

Search ExploreRolling Hills Wind Farm

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Rolling Hills Wind Farm

OperatingWindGEM: retired

Ranked #3 of 122 Wind plants in IA#31 of 1442 nationally

484.2 MW Wind operating in Cass, IA — Midcontinent Independent Transmission System Operator, Inc..

EIAGEMWD

484.2 MW

Nameplate Capacity

1

Generators

unit

Onshore Wind Turbine

Technology

2011

Operating Since

Location

Coordinates

41.1973, -94.7744

County

Cass, IA

Nearby Plants

Prescott Wind Farm
Wind38.7 MW · 16.5 km
Roseman
Wind1.8 MW · 19.3 km
Green Energy Machine
Wind1.7 MW · 19.6 km

Ownership & Operator

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

Ownership Chain

About

Rolling Hills Wind Farm is a 484.2 MW wind power plant located in Cass County, Iowa. The plant began operating in 2011 and is owned by Berkshire Hathaway and operated by MidAmerican Energy Co. It utilizes a single generator consisting of onshore wind turbines. The facility ranks as the 3rd largest of 54 wind farms in Iowa, and 31st out of 734 nationally.

The wind farm's turbines are manufactured by Siemens Gamesa Renewable Energy, model SG2.38 - 129, with a hub height of 80 meters and a rotor diameter of 129 meters. In its most recent year of operation, the plant generated 1,577,482 MWh, achieving a capacity factor of 37.2%. The installed cost of the plant was $1620.54 per kW, according to FERC data. The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the MRO NERC region.

Generated from EIA, GEM, and public data sources

EIA Plant Profile Wikidata Global Energy Monitor

Engineering & Generators

Grid Context

NERC Region

MRO

Balancing Authority

Midcontinent Independent Transmission System Operator, Inc..

Grid Voltage

345 kV

Regulatory Status

RE

Entity Type

Investor-Owned Utility

Sector

Electric Utility

Generation

163.9K MWh

Latest Month

1.6M MWh

Annual Generation

37.2%

Capacity Factor

Jan 2023 – Dec 2025

Financial DataBeta

Source: FERC Form 1HIGH

$1,545/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

Rolling Hills Substation · 345 kV

Substation Distance

< 10 km

Operator

MidAmerican Energy

Coord Source

OSM spatial

Market Position

ISO/RTO Market

MISO

LMP Node

MEC.ROLLHILL_1, MEC.ROLLHILL_2, MEC.ROLLHILL_3

Pricing Hub

MINN.HUB

Node Source

EIA-860 direct report

News & Articles (8)Beta

Hazards·wildfire

Red Flag Warning: Sac; Calhoun; Crawford; Carroll; Greene; Boone; Audubon; Guthrie; Dallas; Polk; Cass; Adair; Madison

Red Flag Warning issued March 21 at 9:44AM CDT until March 21 at 10:00PM CDT by NWS Des Moines IA

Red Flag Warning (hazard)

NWS Des Moines IA·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

'Repowering' era for America's aging wind energy industry begins, despite Trump's effort to kill it

Industry·technology

'Repowering' era for America's aging wind energy industry begins, despite Trump's effort to kill it

"Repowering" of wind turbines is turning into a big business for renewable energy companies including GE Vernova, Vestas and Siemens,...

GE Vernova (other)Vestas (other)

CNBC·11 months 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

Last updated 2026-03-21

View all 8 articles

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EIA Wikidata GEM