Gilliam South
Oil power plant in Adair County, Iowa. 4.3 MW of nameplate capacity across 2 generators, operated by City of Stuart - (IA).
Also known as EIA plant 7857
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 4.3 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- February 2001First generator online
- Operator
- City of Stuart - (IA)EIA operator ID 18231
- Grid
- MISOBalancing authority MISO
- Price nodes
- None linkedNo verified ISO node
- Location
- Adair County, IA41.4961, −94.3272
- EIA plant ID
- 7857EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Gilliam South produces
Free · EIA-923Net generation, 2025
4 MWh
4 MWh, final
Capacity factor, 2025
0.0%
2024: 0.0%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
1.0–30.0
MWh a year. Low 2023, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | 1 | Not reported | 12 of 12 |
| 2003 | 123 | Not reported | 12 of 12 |
| 2004 | 100 | Not reported | 12 of 12 |
| 2005 | 28 | Not reported | 12 of 12 |
| 2006 | 25 | Not reported | 12 of 12 |
| 2007 | 2 | Not reported | 12 of 12 |
| 2008 | 2 | Not reported | 12 of 12 |
| 2009 | 2 | Not reported | 12 of 12 |
| 2010 | 2 | 0.0% | 12 of 12 |
| 2011 | 2 | 0.0% | 12 of 12 |
| 2012 | 5 | Not reported | 12 of 12 |
| 2013 | 0 | 0.0% | 12 of 12 |
| 2014 | 4 | 0.0% | 12 of 12 |
| 2015 | 5 | 0.0% | 12 of 12 |
| 2016 | 4 | 0.0% | 12 of 12 |
| 2017 | 3 | 0.0% | 12 of 12 |
| 2018 | 10 | 0.0% | 12 of 12 |
| 2019 | 12 | 0.0% | 12 of 12 |
| 2020 | 23 | 0.1% | 12 of 12 |
| 2021 | 15 | 0.0% | 12 of 12 |
| 2022 | 30 | 0.1% | 12 of 12 |
| 2023 | 1 | 0.0% | 12 of 12 |
| 2024 | 2 | 0.0% | 12 of 12 |
| 2025 | 4 | 0.0% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Petroleum Liquids | 1.8 | February 2001 |
| 7 | Petroleum Liquids | 2.5 | April 2012 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists City of Stuart - (IA) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Gilliam South
More plants operated by City of Stuart - (IA)
Questions about Gilliam South
How much power does Gilliam South produce?
Gilliam South reported 4 MWh (4 MWh) of net generation in 2025, a 0.0% capacity factor on 4.3 MW of nameplate capacity.
Where is Gilliam South?
Gilliam South is in Adair County, Iowa, at 41.4961, −94.3272. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Gilliam South?
EIA-860M for August 2026 lists City of Stuart - (IA) as the operator (EIA operator ID 18231). The operator is not always the owner.
When did Gilliam South start operating?
Its first generator began operating in February 2001, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page