Marshalltown Generating Station

2115 East Nevada Street, Marshalltown, IA 50158

Plant Summary Information

Marshalltown Generating Station is ranked #3 out of 279 power plants in Iowa in terms of total annual net electricity generation.

Marshalltown Generating Station is comprised of 5 generators and generated 1.3 TWh during the 3-month period between June 2025 to September 2025.

Plant Name	Marshalltown Generating Station
Utility Name	Interstate Power and Light Co
Location	Marshall County, IA
Initial Operation Date	April 2017
Last Update	Sep 2025
Annual Generation	3.4 TWh
Annual Consumption	24.7 M MMBtu
Ranked #345 out of 12,539 Power Plants Nationwide
Ranked #194 out of 2,243 Natural Gas Power Plants Nationwide
Ranked #3 out of 279 Iowa Power Plants
Ranked #1 out of 51 Iowa Natural Gas Power Plants
Fuel Types	Natural Gas : 99.9%

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Monthly Net Generation for Marshalltown Generating Station

Marshalltown Generating Station Details

Summary Information
Plant Name	Marshalltown Generating Station (58236)
Plant Address	2115 East Nevada Street, Marshalltown, IA 50158
Utility	Interstate Power and Light Co (9417)
Latitude, Longitude	42.04333, -92.87278
Generation Dates on File	Apr 2017 to Sep 2025
Initial Operation Date	April 2017
Annual Generation	3.4 TWh
Fuel Types	Natural Gas : 99.9%

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	MRO
Balancing Authority	Midcontinent Independent Transmission System Operator, Inc.. (MISO)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Municipality
Ash Impoundment	No
Transmission / Distribution Owner	ITC Midwest LLC (56161)
Grid Voltage	161.00 kV
Energy Storage	Yes

Natural Gas Information
Pipeline Name	NORTHERN BORDER P L CO
Natural Gas Storage	No

* Data obtained from the 2024 EIA 860 Report

Generator CTG1 Details Operating April 2017

Technology	Natural Gas Fired Combined Cycle
Prime Mover	Combined Cycle Combustion Turbine Part
Unit Code	MGS1
Ownership	Single Owner
Can Bypass Heat Recovery Steam Generator	No
RTO ISO LMP Node Designation	ALTW.CC.MGS1
RTO ISO Location Designation For Reporting Wholesale Sales Data	ALTW.CC.MGS1
Nameplate Capacity	222.7 MW
Nameplate Power Factor	0.85
Summer Capacity	222.4 MW
Winter Capacity	236.3 MW
Minimum Load	90 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	April 2017
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Natural Gas
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	12H
Other Planned Modifications	No
Multiple Fuels	No
Cofire Fuels	No
Switch Between Oil And Natural Gas	No

Generator CTG2 Details Operating April 2017

Technology	Natural Gas Fired Combined Cycle
Prime Mover	Combined Cycle Combustion Turbine Part
Unit Code	MGS1
Ownership	Single Owner
Can Bypass Heat Recovery Steam Generator	No
RTO ISO LMP Node Designation	ALTW.CC.MGS2
RTO ISO Location Designation For Reporting Wholesale Sales Data	ALTW.CC.MGS2
Nameplate Capacity	222.7 MW
Nameplate Power Factor	0.85
Summer Capacity	222.4 MW
Winter Capacity	236.3 MW
Minimum Load	90 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	April 2017
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Natural Gas
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	12H
Other Planned Modifications	No
Multiple Fuels	No
Cofire Fuels	No
Switch Between Oil And Natural Gas	No

Generator STG1 Details Operating April 2017

Technology	Natural Gas Fired Combined Cycle
Prime Mover	Combined Cycle Steam Part
Unit Code	MGS1
Ownership	Single Owner
Duct Burners	No
RTO ISO LMP Node Designation	ALTW.CC.MGS2
RTO ISO Location Designation For Reporting Wholesale Sales Data	ALTW.CC.MGS2
Nameplate Capacity	260.5 MW
Nameplate Power Factor	0.85
Summer Capacity	221 MW
Winter Capacity	224.9 MW
Minimum Load	80 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	April 2017
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Natural Gas
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	12H
Multiple Fuels	No
Cofire Fuels	No
Switch Between Oil And Natural Gas	No

Generator BESS1 Details Operating October 2020

Technology	Batteries
Prime Mover	Battery
Unit Code	MGPV
Ownership	Single Owner
Nameplate Capacity	0.3 MW
Summer Capacity	0.3 MW
Winter Capacity	0.3 MW
Uprate/Derate Completed	No
Status	Operating
First Operation Date	October 2020

Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Electricity used for energy storage
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Other Planned Modifications	No
Multiple Fuels	No
Cofire Fuels	No

Energy Storage Details
Nameplate Energy Capacity MWH	0.6
Maximum Charge Rate	0.3 MW
Maximum Discharge Rate	0.3 MW
Storage Technology	LIB
Nameplate Reactive Power Rating	0.1
Storage Enclosure Type	CS
Co Located Renewable Firming	Yes
Load Management	P
Excess Wind And Solar Generation	Yes
Ac Coupled	Yes
Direct Support Of Another Unit	Yes
Direct Support Plant Id	58236
Direct Support Gen Id	PV1
Support T D Asset	No

Generator PV1 Details Operating February 2020

Technology	Solar Photovoltaic
Prime Mover	Photovoltaic
Ownership	Single Owner
Nameplate Capacity	2.6 MW
Nameplate Power Factor	1
Summer Capacity	2.6 MW
Winter Capacity	2.1 MW
Uprate/Derate Completed	No
Status	Operating

First Operation Date	February 2020
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Solar
Solid Fuel Gasification	No
Carbon Capture Technology	No
Other Planned Modifications	No
Multiple Fuels	No

Solar Details
Fixed Tilt	Yes
Azimuth Angle	180
Tilt Angle	25
DC Net Capacity	3.4 MW
Crystalline Silicon	Yes
Other Materials	Yes
Net Metering Agreement	No
Virtual Net Metering Agreement	No

Marshalltown Generating Station Plant Owners

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power Plants with Similar Net Generation

Power plants with a similar annual net generation from Natural Gas.

Rank	Plant Name	Plant Location	Annual Generation
#184	McWilliams	Gantt, AL	3.5 TWh
#185	Harquahala Generating Project	Tonopah, AZ	3.5 TWh
#186	High Desert Power Plant	Victorville, CA	3.5 TWh
#187	Bridgeport Station	Bridgeport, CT	3.5 TWh
#188	Arthur Von Rosenberg	Elmendorf, TX	3.4 TWh
#189	Arlington Valley Energy Facility	Arlington, AZ	3.4 TWh
#190	Dearborn Industrial Generation	Dearborn, MI	4.0 TWh
#191	Central Alabama Generating Station	Billingsley, AL	3.4 TWh
#192	Jasper	Hardeeville, SC	3.4 TWh
#193	Grays Harbor Energy Facility	Elma, WA	3.4 TWh
#195	Athens Generating Plant	Athens, NY	3.4 TWh
#196	Jack Fusco Energy Center	Thompsons, TX	3.4 TWh
#197	L V Sutton Combined Cycle	Wilmington, NC	3.4 TWh
#198	Rhode Island State Energy Center	Johnston, RI	3.3 TWh
#199	Northeastern	Oologah, OK	5.1 TWh
#200	J Lamar Stall Unit	Shreveport, LA	3.3 TWh
#201	Carty Generating Station	Boardman, OR	3.3 TWh
#202	Red Oak Power LLC	Sayreville, NJ	3.3 TWh
#203	Hermiston Power Partnership	Hermiston, OR	3.3 TWh
#204	Hermiston Generating Plant	Hermiston, OR	3.3 TWh

Nearby Power Plants

Below are closest 20 power plants surrounding Marshalltown Generating Station.

Plant Name	Plant Location	Annual Generation	Distance
Alliant SBD 9107 JBS USA	Marshalltown, IA	61.7 MWh	1.5 mi
Brooklyn	Brooklyn, IA	18.0 MWh	30.9 mi
Brooklyn City North Plant	Brooklyn, IA	14.0 MWh	30.6 mi
Dike City Power Plant	Dike, IA	50.0 MWh	31.6 mi
FPL Energy Story Wind LLC	Zearing, IA	525.2 GWh	20.9 mi
Garden Wind LLC	Zearing, IA	345.4 GWh	28.6 mi
Grinnell College	Grinnell, IA	1.6 GWh	21.1 mi
Ivester Wind Farm	Wellsburg, IA	329.4 GWh	20.4 mi
Laurel Wind Farm	Laurel, IA	463.1 GWh	11.5 mi
Marshalltown	Marshalltown, IA	79.0 GWh	0.7 mi
Michelangelo Wind 3 LLC	Huxley, IA	8.6 GWh	33 mi
Optimum Wind 3 LLC	Nevada, IA	10.4 GWh	32.9 mi
Optimum Wind 4 LLC	Nevada, IA	10.5 GWh	33.1 mi
Optimum Wind 5 LLC	Nevada, IA	9.0 GWh	33.2 mi
Optimum Wind 7 LLC	Nevada, IA	11.0 GWh	28.6 mi
State Center	State Center, IA	75.0 MWh	15 mi
Traer Wind Project	Traer, IA	5.8 GWh	23.5 mi
Venus Wind 3 LLC	Grinnell, IA	10.3 GWh	23.2 mi
Vienna Wind Farm	Marshalltown, IA	397.6 GWh	9.4 mi
Wellsburg Wind Project	Wellsburg, IA	468.7 GWh	24.5 mi