Emery Station
Cerro Gordo County, Iowa · EIA plant ID 8031 · Operator: Interstate Power and Light Co
Nameplate603MWSummer 539 MW
Generators3in service
Net generation2,379GWh12 mo to Aug 2026
Capacity factor50%gas/coal/oil units, summer MW
Heat rate7,893Btu/kWhfossil units, electric fuel, HHV
First online2004Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2004 | 471.1 | 14.4% | 7,112 |
| 2005 | 1,564.7 | 32.1% | 7,851 |
| 2006 | 1,334.2 | 27.3% | 7,346 |
| 2007 | 1,646.3 | 34.1% | 7,848 |
| 2008 | 927.8 | 19.1% | 7,549 |
| 2009 | 584.9 | 12.9% | 7,583 |
| 2010 | 530.1 | 11.7% | 7,572 |
| 2011 | 464.4 | 10.1% | 8,224 |
| 2012 | 868.2 | 18.4% | 7,365 |
| 2013 | 774.2 | 17.8% | 7,286 |
| 2014 | 1,013.8 | 22.5% | 7,262 |
| 2015 | 1,747.5 | 39.1% | 6,973 |
| 2016 | 1,791 | 40.4% | 7,070 |
| 2017 | 1,980.1 | 44.9% | 6,917 |
| 2018 | 2,447.3 | 53.8% | 6,865 |
| 2019 | 2,561.9 | 54.6% | 7,109 |
| 2020 | 2,568.7 | 53.5% | 6,923 |
| 2021 | 1,944.5 | 40.9% | 7,313 |
| 2022 | 1,787.1 | 38.5% | 8,595 |
| 2023 | 2,898.3 | 62.3% | 7,952 |
| 2024 | 2,357.4 | 50.5% | 7,867 |
| 2025 | 2,454.8 | 51.9% | 7,801 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 11 | Natural Gas Fired Combined Cycle | CT | 173.4 | 148.2 | May 2004 | Operating | — | coming soon |
| 12 | Natural Gas Fired Combined Cycle | CT | 173.4 | 148.9 | May 2004 | Operating | — | coming soon |
| ST1 | Natural Gas Fired Combined Cycle | CA | 256 | 242.3 | May 2004 | Operating | — | coming soon |
Owner / operator
Operator: Interstate Power and Light Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Interstate Power and Light Co | 100.0% | 603 MW |
Nearby plants
Within 80 km.
| REG Mason City Solar | 3 MW | 5.2 km |
| Cerro Gordo Wind Farm | 42 MW | 13.6 km |
| Hawkeye Power Partners LLC | 42 MW | 15.9 km |
| CED Mason City Wind | 8 MW | 16.6 km |
| Lime Creek | 90 MW | 18.5 km |
| Roeder Family Wind Farm LLC | 2 MW | 22.6 km |