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Marshalltown — renewablesinfo.org

Marshalltown — Plant Summary

EIA Plant ID: 1068
Capacity: 189 MW
Primary Fuel: Natural Gas
Technology: Natural Gas Fired Combustion Turbine
Status: Operating
Location: Marshall, IA
Operating Since: 1978
Generators: 3
Operator: Interstate Power and Light Co
Parent Company: Alliant Energy
Annual Generation: 79,031 MWh
Capacity Factor: 4.7%
Balancing Authority: Midcontinent Independent Transmission System Operator, Inc..
ISO/RTO: MISO
NERC Region: MRO

Search ExploreMarshalltown

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Marshalltown

OperatingNatural Gas

Ranked #7 of 39 Natural Gas plants in IA#764 of 2009 nationally

189 MW Natural Gas operating in Marshall, IA — Midcontinent Independent Transmission System Operator, Inc..

EIAWD

189 MW

Nameplate Capacity

3

Generators

units

Natural Gas Fired Combustion Turbine

Technology

1978

Operating Since

Location

Coordinates

42.0474, -92.8594

County

Marshall, IA

Nearby Plants

Marshalltown Generating Station
Natural Gas708.8 MW · 1.2 km
Higgins Generating Station
Natural Gas688.4 MW · 1.2 km
Alliant SBD 9107 JBS USA
Distillate Oil11.4 MW · 3.2 km

Ownership & Operator

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	—	—

Ownership Chain

About

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

EIA Plant Profile Wikidata

Engineering & Generators

Grid Context

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

Generation

5.7K MWh

Latest Month

79.0K MWh

Annual Generation

4.7%

Capacity Factor

Jan 2022 – Dec 2024

Financial DataBeta

Source: FERC Form 1HIGH

$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

Pricing & Market Data

HIGH confidence

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

News & Articles (10)Beta

Linn County gas-fired power plant ordinance amended again

Regulatory·permitting

Linn County gas-fired power plant ordinance amended again

A new Linn County zoning ordinance amendment governing the siting of gas-fired electrical power plants in the county's rural areas was...

Linn County (regulator)

Corridor Business Journal·2 days ago

Linn County gas-fired power plant ordinance amended for setback ‘flexibility’

Regulatory·permitting

Linn County gas-fired power plant ordinance amended for setback ‘flexibility’

The first reading of a new zoning ordinance amendment governing the siting of natural gas-fired power plants in Linn County's unincorporated...

Linn County (regulator)

Corridor Business Journal·4 days ago

Alliant Energy proposes new site near Fairfax for natural gas power plant

Industry·corporate

Alliant Energy proposes new site near Fairfax for natural gas power plant

Alliant Energy is pursuing a new site near Fairfax for a proposed natural gas-fired power plant, after a previous proposal to build the...

Alliant Energy (developer)

Corridor Business Journal·1 weeks ago

Alliant Energy gets OK to build second power plant in Marshalltown

Regulatory·permitting

Alliant Energy gets OK to build second power plant in Marshalltown

Alliant Energy has been approved to build a 720-megawatt power plant in Marshalltown. Bobcat Energy Center will sit adjacent to Alliant's...

Alliant Energy (developer)

The Gazette·3 months ago

Last updated 2026-03-14

View all 10 articles

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