Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/58236
EIA plant 58236
Marshalltown · Marshall · IA
Marshalltown Generating Station
Operated by Interstate Power and Light Co
Published location
Where is Marshalltown Generating Station?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
42.043333, -92.872778
Open the interactive map ↗Map data © OpenStreetMap contributors
Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the IA plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
1372,300
2238,651
3139,326
41,885
5317,178
6327,519
7462,095
8466,973
9368,946
10141,907
11319,666
12342,502
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 372,300 |
| 2 | 238,651 |
| 3 | 139,326 |
| 4 | 1,885 |
| 5 | 317,178 |
| 6 | 327,519 |
| 7 | 462,095 |
| 8 | 466,973 |
| 9 | 368,946 |
| 10 | 141,907 |
| 11 | 319,666 |
| 12 | 342,502 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 372,300 MWh |
| 2 | 238,651 MWh |
| 3 | 139,326 MWh |
| 4 | 1,885 MWh |
| 5 | 317,178 MWh |
| 6 | 327,519 MWh |
| 7 | 462,095 MWh |
| 8 | 466,973 MWh |
| 9 | 368,946 MWh |
| 10 | 141,907 MWh |
| 11 | 319,666 MWh |
| 12 | 342,502 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| STG1 | Natural Gas Fired Combined Cycle | NG | 260.5 | OP |
| CTG1 | Natural Gas Fired Combined Cycle | NG | 222.7 | OP |
| CTG2 | Natural Gas Fired Combined Cycle | NG | 222.7 | OP |
| PV1 | Solar Photovoltaic | SUN | 2.6 | OP |
| BESS1 | Batteries | MWH | 0.3 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
58236
Sector
Electric Utility
Water source
Municipality
Data edition
2024-final
Use this record
Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Marshalltown Generating Station power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Marshalltown Generating Station
Variation in the published months
Across 12 numeric monthly generation entries, 8 has the highest recorded value (466,973 MWh) and 4 the lowest (1,885 MWh). Their difference is 465,088 MWh. Missing months have not been treated as zero.
Reading the MW column
In the 5 numeric rows displayed in this table, MW ranges from 0.3 (BESS1) to 260.5 (STG1). The difference is 260.2 in the column's stated units. This summary covers the displayed rows and retains the table's period and scope.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| BESS1 | Batteries | 0.3 | 0.3 | 0.3 | 0.0 |
| CTG1 | Natural Gas Fired Combined Cycle | 222.7 | 222.4 | 236.3 | 90.0 |
| CTG2 | Natural Gas Fired Combined Cycle | 222.7 | 222.4 | 236.3 | 90.0 |
| PV1 | Solar Photovoltaic | 2.6 | 2.6 | 2.1 | 0.0 |
| STG1 | Natural Gas Fired Combined Cycle | 260.5 | 221.0 | 224.9 | 80.0 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.