Sioux

8501 N. State Route 94, West Alton, MO 63386

Plant Summary Information

Sioux is ranked #45 out of 122 coal plants nationwide in terms of total annual net electricity generation.

Sioux is comprised of 2 generators and generated 845.0 GWh during the 3-month period between February 2026 to May 2026.

Plant Name	Sioux
Utility Name	Union Electric Co - (MO)
Location	St. Charles County, MO
Initial Operation Date	May 1967
Last Update	May 2026
Annual Generation	3.8 TWh
Annual Consumption	43.9 M MMBtu
Ranked #301 out of 13,081 Power Plants Nationwide
Ranked #45 out of 122 Subbituminous Coal Power Plants Nationwide
Ranked #6 out of 127 Missouri Power Plants
Ranked #5 out of 9 Missouri Subbituminous Coal Power Plants
Fuel Types	Subbituminous Coal : 78.0% Bituminous Coal : 21.9%

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Summary Information
Plant Name	Sioux (2107)
Plant Address	8501 N. State Route 94, West Alton, MO 63386
Utility	Union Electric Co - (MO) (19436)
Latitude, Longitude	38.91548, -90.29025
Generation Dates on File	Jan 2001 to May 2026
Initial Operation Date	May 1967
Annual Generation	3.8 TWh
Fuel Types	Subbituminous Coal : 78.0% Bituminous Coal : 21.9%

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	SERC
Balancing Authority	Midcontinent Independent Transmission System Operator, Inc.. (MISO)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Mississippi River
Ash Impoundment	Yes Lined Operating
Transmission / Distribution Owner	Union Electric Co - (MO) (19436) MO
Grid Voltage	138.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Steam Coal
Prime Mover	Steam Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	AMMO.SIOUX1
RTO ISO Location Designation For Reporting Wholesale Sales Data	AMMO.SIOUX1
Nameplate Capacity	549.7 MW
Nameplate Power Factor	0.85
Summer Capacity	487 MW
Winter Capacity	497 MW
Minimum Load	253 MW
Uprate/Derate Completed	No
Status	Operating
First Operation Date	May 1967

Planned Retirement	December 2028
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Subbituminous Coal / Bituminous Coal
Startup Source	Distillate Fuel Oil
Solid Fuel Gasification	No
Time From Cold Shutdown To Full Load	OVER
Pulverized Coal Technology	Yes
Supercritical Technology	Yes
Multiple Fuels	Yes
Cofire Fuels	No
Switch Between Oil And Natural Gas	No

Technology	Conventional Steam Coal
Prime Mover	Steam Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	AMMO.SIOUX2
RTO ISO Location Designation For Reporting Wholesale Sales Data	AMMO.SIOUX2
Nameplate Capacity	549.7 MW
Nameplate Power Factor	0.85
Summer Capacity	487 MW
Winter Capacity	497 MW
Minimum Load	252 MW
Uprate/Derate Completed	No
Status	Operating
First Operation Date	May 1968

Planned Retirement	December 2028
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Subbituminous Coal / Bituminous Coal
Startup Source	Distillate Fuel Oil
Solid Fuel Gasification	No
Time From Cold Shutdown To Full Load	OVER
Pulverized Coal Technology	Yes
Supercritical Technology	Yes
Multiple Fuels	Yes
Cofire Fuels	No
Switch Between Oil And Natural Gas	No

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power plants with a similar annual net generation from Subbituminous Coal.

Rank	Plant Name	Plant Location	Annual Generation
#35	White Bluff	Redfield, AR	3.6 TWh
#36	Welsh	Pittsburg, TX	3.5 TWh
#37	Ottumwa	Ottumwa, IA	3.5 TWh
#38	Newton	Newton, IL	3.4 TWh
#39	Dave Johnston	Glen Rock, WY	3.2 TWh
#40	Powerton	Pekin, IL	3.2 TWh
#41	Craig (CO)	Craig, CO	3.2 TWh
#42	Sandy Creek Energy Station	Riesel, TX	3.2 TWh
#43	Transalta Centralia Generation	Centralia, WA	3.2 TWh
#44	John W Turk Jr Power Plant	Fulton, AR	3.1 TWh
#46	Coleto Creek	Fannin, TX	2.9 TWh
#47	Flint Creek	Gentry, AR	2.8 TWh
#48	Plum Point Energy Station	Osceola, AR	2.7 TWh
#49	Tolk	Muleshoe, TX	3.1 TWh
#50	Coronado	St Johns, AZ	2.6 TWh
#51	Dry Fork Station	Gillette, WY	2.6 TWh
#52	Sooner	Red Rock, OK	2.5 TWh
#53	Kincaid Generation LLC	Kincaid, IL	2.4 TWh
#54	Kingston	Kingston, TN	3.4 TWh
#55	R S Nelson	Westlake, LA	2.3 TWh

Below are closest 20 power plants surrounding Sioux.

Plant Name	Plant Location	Annual Generation	Distance
AES Belleville Solar LLC	Belleville, IL	5.9 GWh	33.1 mi
Anheuser-Busch St Louis	St. Louis, MO	38.1 GWh	22.4 mi
Edwardsville Solar II	Edwardsville, IL	4.1 GWh	17.2 mi
Granite City Works	Granite City, IL	447.9 GWh	17.4 mi
Hickory Solar	Jerseyville, IL	254.8 GWh	15.6 mi
Highland	Highland, IL	222.5 MWh	34.7 mi
IKEA St. Louis 410	St. Louis, MO	328.0 MWh	19.5 mi
Midwest Power Partners LLC (Pirolo)	Williamson, IL	9.1 GWh	29.3 mi
Milam Gas Recovery	East St. Lois, IL	19.4 GWh	19.6 mi
Mulberry Solar, LLC	Granite City, IL	4.0 GWh	15.4 mi
O'Fallon Renewable Energy Center	O'Fallon, MO	1.1 GWh	21.7 mi
Renewable Energy Center at BJH	St Louis, MO	677.0 MWh	19.4 mi
SCS American Bottoms 009885 Sauget, LLC	Sauget, IL	1.9 GWh	23.1 mi
South Belleville Solar, LLC	Smithton Township, IL	385.0 MWh	34.1 mi
Southwestern Bell Telephone	St. Louis, MO	105.0 MWh	20.6 mi
St. Clair Solar 3	Washington Park, IL	3.5 GWh	23 mi
St. Clair Solar 5	Lebanon, IL	1.5 GWh	34.4 mi
Trigen St. Louis	St Louis, MO	86.1 GWh	20.2 mi
Venice	Venice, IL	18.3 GWh	18.4 mi
Winfield Solar	Winfield, MO	281.2 GWh	31.2 mi