Power plant · EIA plant code 58236
Marshalltown Generating Station
- Operator
- Interstate Power and Light Co
- Location
- Marshall, IA (county level only)
- Balancing authority
- Midcontinent Independent Transmission System Operator, Inc.. (MISO)
- Nameplate capacity
- 708.8 MW
- Summer capacity
- 668.1 MW
U.S. Energy Information Administration · Annual Electric Generator Report (Form EIA-860) · data for 2025 · as of Sep 10, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Sep 10, 2027. Last checked for an update: Oct 31, 2026.
Generation in 2025
- Net generation
- 3,177,931 MWh
- Capacity factor
- 51.2%
Capacity factor is net generation divided by nameplate capacity times the hours each generator was in service that year, counted by month.
U.S. Energy Information Administration · Power Plant Operations Report (Form EIA-923) · data for 2025 · as of Sep 11, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Sep 11, 2027. Last checked for an update: Oct 31, 2026.
Emissions
- Carbon dioxide in 2023
- 1,432,613 metric tons
- Carbon dioxide per MWh
- 882 lb/MWh
eGRID reports 1,579,186 short tons. One short ton is 0.90718474 metric tons.
Emissions are for 2023, the newest eGRID year. Generation is for 2025, the newest EIA-923 year.
U.S. Environmental Protection Agency · Emissions & Generation Resource Integrated Database (eGRID) · data for 2023 · as of Jun 16, 2025 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Jan 31, 2026. Last checked for an update: Oct 31, 2026.
Generators
| Generator | Technology | Energy source | Nameplate | Operating since | Status |
|---|---|---|---|---|---|
| BESS1 | Batteries | MWH | 0.3 MW | 2020 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| CTG1 | Natural Gas Fired Combined Cycle | NG | 222.7 MW | 2017 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| CTG2 | Natural Gas Fired Combined Cycle | NG | 222.7 MW | 2017 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| PV1 | Solar Photovoltaic | SUN | 2.6 MW | 2020 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| STG1 | Natural Gas Fired Combined Cycle | NG | 260.5 MW | 2017 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
U.S. Energy Information Administration · Monthly Update to the Annual Electric Generator Report (Form EIA-860M) · data for 2026-09 · as of Oct 23, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Nov 23, 2026. Last checked for an update: Oct 31, 2026.