Sioux
Coal power plant in St Charles County, Missouri. 1,099.4 MW of nameplate capacity across 2 generators, operated by Union Electric Co - (MO).
Also known as Ameren Sioux Power Plant · EIA plant 2107
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Key facts
- Capacity
- 1,099.4 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- May 1967First generator online
- Operator
- Union Electric Co - (MO)EIA operator ID 19436
- Grid
- MISOBalancing authority MISO
- Price nodes
- 2 MISO nodesResource nodes with prices
- Location
- St Charles County, MO38.9155, −90.2903
- EIA plant ID
- 2107EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Sioux produces
Free · EIA-923Net generation, 2025
3.99 TWh
3,986,364 MWh, final
Capacity factor, 2025
41.4%
2024: 34.6%
January to July 2026
2.16 TWh
Provisional
Range, 2015 to 2025
2.7–5.7
TWh a year. Low 2020, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 4,877,280 | Not reported | 12 of 12 |
| 2001 | 5,645,812 | Not reported | 12 of 12 |
| 2002 | 6,296,711 | Not reported | 12 of 12 |
| 2003 | 6,332,833 | Not reported | 12 of 12 |
| 2004 | 6,226,046 | Not reported | 12 of 12 |
| 2005 | 6,636,478 | Not reported | 12 of 12 |
| 2006 | 6,398,439 | Not reported | 12 of 12 |
| 2007 | 6,643,346 | Not reported | 12 of 12 |
| 2008 | 5,848,633 | Not reported | 12 of 12 |
| 2009 | 5,760,507 | Not reported | 12 of 12 |
| 2010 | 5,733,024 | 59.5% | 12 of 12 |
| 2011 | 5,209,936 | 54.1% | 12 of 12 |
| 2012 | 4,905,611 | 50.8% | 12 of 12 |
| 2013 | 5,080,395 | 52.8% | 12 of 12 |
| 2014 | 4,964,295 | 51.5% | 12 of 12 |
| 2015 | 4,495,381 | 46.7% | 12 of 12 |
| 2016 | 4,549,155 | Not reported | 12 of 12 |
| 2017 | 4,978,092 | 51.7% | 12 of 12 |
| 2018 | 5,664,891 | 58.8% | 12 of 12 |
| 2019 | 3,885,566 | 40.3% | 12 of 12 |
| 2020 | 2,749,389 | 28.5% | 12 of 12 |
| 2021 | 3,886,900 | 40.4% | 12 of 12 |
| 2022 | 3,665,843 | Not reported | 12 of 12 |
| 2023 | 3,050,511 | 31.7% | 12 of 12 |
| 2024 | 3,337,571 | 34.6% | 12 of 12 |
| 2025 | 3,986,364 | 41.4% | 12 of 12 |
| 2026 (provisional, partial year) | 2,159,550 | 38.6% | 7 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 account · MISOEmissions
Free · EPA CAMPDCO₂, 2025
4.60M
US short tons. 2024: 3.72M
SO₂, 2025
1,704
US short tons
NOx, 2025
4,561
US short tons
CO₂ per MWh, calculated
1.15 t
About 2,310 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (1, 2), matched to EIA plant 2107 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
238,045
million gallons
Consumption, 2024
0
million gallons
Source
Mississippi River
Surface, Fresh. Once-through
Watershed stress
Very low/none · 0.177
USGS SUI, HUC12 City of Alton-Mississippi River
24 of 24 cooling months report withdrawal. SUI of the source river HUC12 within 3 km. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Steam Coal | 549.7 | May 1967 |
| 2 | Conventional Steam Coal | 549.7 | May 1968 |
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 Union Electric Co - (MO) 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 Sioux
More plants operated by Union Electric Co - (MO)
Questions about Sioux
How much power does Sioux produce?
Sioux reported 3,986,364 MWh (3.99 TWh) of net generation in 2025, a 41.4% capacity factor on 1,099.4 MW of nameplate capacity. From January to July 2026 it reported 2.16 TWh, which is provisional.
Where is Sioux?
Sioux is in St Charles County, Missouri, at 38.9155, −90.2903. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Sioux?
EIA-860M for August 2026 lists Union Electric Co - (MO) as the operator (EIA operator ID 19436). The operator is not always the owner.
When did Sioux start operating?
Its first generator began operating in May 1967, according to EIA-860M.
Does InfraMap have power prices for Sioux?
Yes. InfraMap has MISO day-ahead and real-time prices at 2 price nodes linked to Sioux, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page