Sioux Power Plant

From Global Energy Monitor

Sioux Power Plant is a 1,099.4-megawatt (MW) coal-fired power station owned and operated by Ameren near West Alton, Missouri.


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Plant Data

  • Owner: Union Electric Company
  • Parent Company: Ameren
  • Plant Nameplate Capacity: 1,099.4 MW (Megawatts)
  • Units and In-Service Dates: Unit 1: 549.7 MW (1967), Unit 2: 549.7 MW (1968)
  • Location: 8501 N. State Route 94, West Alton, MO 63386
  • GPS Coordinates: 38.915012, -90.289320
  • Technology: Subcritical
  • Coal type: Sub Bituminous / Bituminous
  • Coal Consumption:
  • Coal Source: Black Thunder Mine (Arch Coal), Antelope Coal Mine (Navajo Nation), North Antelope Rochelle Mine (Peabody Energy), Gateway Mine (Peabody Energy), Prairie Eagle Surface Mine (Knighthawk)[1]
  • Number of Employees:
  • Unit Retirement: Both units are scheduled for retirement in 2028.[2]

Plant Retirement

On October 1, 2014, Ameren filed an integrated resource plan with the Missouri Public Service Commission that indicates a plan to close the Sioux plant no later than 2033, in part to comply with the EPA Clean Air Act Section 111(d) requirements.[3]

In October 2020 Ameren said its Sioux Power Plant would now retire in 2028.[2]

Emissions Data

  • 2006 CO2 Emissions: 6,273,478 tons
  • 2006 SO2 Emissions: 44,148 tons
  • 2006 SO2 Emissions per MWh:
  • 2006 NOx Emissions: 7,340 tons
  • 2005 Mercury Emissions: 367 lb.

Death and disease attributable to fine particle pollution from Sioux Power Plant

In 2010, Abt Associates issued a study commissioned by the Clean Air Task Force, a nonprofit research and advocacy organization, quantifying the deaths and other health effects attributable to fine particle pollution from coal-fired power plants.[4] Fine particle pollution consists of a complex mixture of soot, heavy metals, sulfur dioxide, and nitrogen oxides. Among these particles, the most dangerous are those less than 2.5 microns in diameter, which are so tiny that they can evade the lung's natural defenses, enter the bloodstream, and be transported to vital organs. Impacts are especially severe among the elderly, children, and those with respiratory disease. The study found that over 13,000 deaths and tens of thousands of cases of chronic bronchitis, acute bronchitis, asthma, congestive heart failure, acute myocardial infarction, dysrhythmia, ischemic heart disease, chronic lung disease, and pneumonia each year are attributable to fine particle pollution from U.S. coal plant emissions. These deaths and illnesses are major examples of coal's external costs, i.e. uncompensated harms inflicted upon the public at large. Low-income and minority populations are disproportionately impacted as well, due to the tendency of companies to avoid locating power plants upwind of affluent communities. To monetize the health impact of fine particle pollution from each coal plant, Abt assigned a value of $7,300,000 to each 2010 mortality, based on a range of government and private studies. Valuations of illnesses ranged from $52 for an asthma episode to $440,000 for a case of chronic bronchitis.[5]

Table 1: Death and disease attributable to fine particle pollution from the Sioux Power Plant

Type of Impact Annual Incidence Valuation
Deaths 95 $700,000,000
Heart attacks 150 $16,000,000
Asthma attacks 1,600 $84,000
Hospital admissions 68 $1,600,000
Chronic bronchitis 59 $26,000,000
Asthma ER visits 100 $38,000

Source: "Find Your Risk from Power Plant Pollution," Clean Air Task Force interactive table, accessed February 2011

Coal Waste Site

Sioux ranked 95th on list of most polluting power plants in terms of coal waste

In January 2009, Sue Sturgis of the Institute of Southern Studies compiled a list of the 100 most polluting coal plants in the United States in terms of coal combustion waste (CCW) stored in surface impoundments like the one involved in the TVA Kingston Fossil Plant coal ash spill.[6] The data came from the EPA's Toxics Release Inventory (TRI) for 2006, the most recent year available.[7]

Sioux Power Plant ranked number 95 on the list, with 226,193 pounds of coal combustion waste released to surface impoundments in 2006.[6]

Articles and Resources


  1. "EIA 923 July 2020" EIA 923 July 2020.
  2. 2.0 2.1 "Ameren’s renewable energy plan sparks questions about costs and its coal plants", October 11, 2020
  3. 2014 Integrated Resource Plan, Ameren, accessed 13 October 2020
  4. "The Toll from Coal: An Updated Assessment of Death and Disease from America's Dirtiest Energy Source," Clean Air Task Force, September 2010.
  5. "Technical Support Document for the Powerplant Impact Estimator Software Tool," Prepared for the Clean Air Task Force by Abt Associates, July 2010
  6. 6.0 6.1 Sue Sturgis, "Coal's ticking timebomb: Could disaster strike a coal ash dump near you?," Institute for Southern Studies, January 4, 2009.
  7. TRI Explorer, EPA, accessed January 2009.

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