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484.2 MW Wind operating in Cass, IA
484.2 MW
Nameplate Capacity
1
Generators
unit
Onshore Wind Turbine
Technology
2011
Operating Since
Coordinates
41.1973, -94.7744
County
Cass, IA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | MidAmerican Energy Co | MidAmerican Energy | — |
| Owner(s) | MidAmerican Energy Co | Berkshire Hathaway | — |
| Status | Operating | retired | — |
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
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.
163.9K MWh
Latest Month
1.6M MWh
Annual Generation
37.2%
Capacity Factor
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Wind · MidAmerican Energy Company · Data from 2015–2024
$1,545/kW
Installed Cost
$6.5/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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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
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 2026-04-19
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