189 MW Natural Gas operating in Marshall, IA — Midcontinent Independent Transmission System Operator, Inc..
189 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combustion Turbine
Technology
1978
Operating Since
Coordinates
42.0474, -92.8594
County
Marshall, IA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Interstate Power and Light Co | Interstate Power and Light | — |
| Owner(s) | Interstate Power and Light Co | Alliant Energy | — |
| Status | Operating | — | — |
The Marshalltown Generating Station is a 189 MW natural gas-fired power plant located in Marshall County, Iowa. The plant began operating in 1978 and consists of three natural gas-fired combustion turbine generators. It is owned by Alliant Energy and operated by Interstate Power and Light Co. The plant is connected to the Midcontinent Independent Transmission System Operator (MISO) balancing authority. Marshalltown ranks as the 6th largest power plant in Iowa out of 13, and 762nd nationally out of 945 plants.
In the most recent year of reported data, the plant generated 79,031 MWh of electricity, operating at a capacity factor of 4.7%. Financial data indicates an installed cost of $141.79 per kW, according to FERC filings. News coverage related to the plant includes 6 articles categorized as industry news, 3 as regulatory news, and 1 as grid-related news.
Generated from EIA, GEM, and public data sources
NERC Region
MRO
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
115 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
5.7K MWh
Latest Month
79.0K MWh
Annual Generation
4.7%
Capacity Factor
$330/kW
Installed Cost
$38.7/MWh
Operating Cost
Interstate Power and Light Company
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Point of Interconnection
Nearest Substation
Marshalltown Substation · 161 kV
Substation Distance
< 10 km
Operator
ITC
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
ALTW.MTOWNCT1
Pricing Hub
MINN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
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Linn County gas-fired power plant ordinance amended for setback ‘flexibility’
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Alliant Energy gets OK to build second power plant in Marshalltown
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Last updated 2026-03-14
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