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1099.4 MW Sub. Coal operating in St Charles, MO
1,099.4 MW
Nameplate Capacity
2
Generators
units
Conventional Steam Coal
Technology
1967
Operating Since
Coordinates
38.9155, -90.2903
County
St Charles, MO
Nearby Plants
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Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Union Electric Co - (MO) | — | Ameren Missouri |
| Owner(s) | Union Electric Co - (MO) | — | — |
| Status | Operating | — | — |
Sioux Power Plant is a coal-fired power plant in Missouri.
Read more on WikipediaThe Sioux power plant is a 1099.4 MW coal-fired generating station located in St. Charles County, Missouri. The plant began operating in 1967 and utilizes conventional steam coal technology with subbituminous coal (SUB) as its primary fuel. It consists of two generating units and is operated by Union Electric Co. (MO). Sioux ranks as the 5th largest power plant in Missouri (out of 6 total plants) and 35th nationally (out of 75 plants).
Sioux operates within the Midcontinent Independent Transmission System Operator, Inc. (MISO) balancing authority and the SERC NERC region. The plant's latest annual generation was 3,986,364 MWh, achieving a capacity factor of 41.6%. Financial data indicates an installed cost of $1298.67 per kW, as reported to FERC.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
323.6K MWh
Latest Month
4.0M MWh
Annual Generation
41.6%
Capacity Factor
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CO₂ Intensity
2316 lb/MWh
NOx
2 lb/MWh
SO₂
0.591 lb/MWh
CH₄
0.252 lb/MWh
N₂O
0.037 lb/MWh
Capacity Factor
31.7%
Annual Net Gen
3051 GWh
CO₂eq
2333 lb/MWh
Subregion
SERC Midwest
Steam turbine · UNION ELECTRIC COMPANY · Data from 2015–2024
$1,456/kW
Installed Cost
$9/kW
Annual CapEx
$37.7/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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Market Position
ISO/RTO Market
MISO
LMP Node
AMMO.SIOUX1
Pricing Hub
ILLINOIS.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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