Allen S. King Generating Plant

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Allen S. King Generating Plant is an operating power station of at least 598-megawatts (MW) in Stillwater, Washington, Minnesota, United States.


Table 1: Project-level location details

Plant name Location Coordinates (WGS 84)
Allen S. King Generating Plant Stillwater, Washington, Minnesota, United States 45.032414, -92.778776 (exact)

The map below shows the exact location of the power station.

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Unit-level coordinates (WGS 84):

  • Unit 1: 45.032414, -92.778776

Project Details

Table 2: Unit-level details

Unit name Status Fuel(s) Capacity (MW) Technology Start year Retired year
Unit 1 operating coal - subbituminous 598.4 supercritical 1958 2028 (planned)

Table 3: Unit-level ownership and operator details

Unit name Owner
Unit 1 Northern States Power Co [100.0%]

Project-level coal details

  • Coal source(s): Black Thunder Mine (Arch coal), North Antelope Rochelle Mine (Peabody Coal)


In May 2019, Xcel said it would retire the coal plant in 2028.[1]

As of June 2020, the power station was owned by Northern States Power Company.[2]

As of July 2020, the power station burned coal from Black Thunder Mine (Arch coal) and North Antelope Rochelle Mine (Peabody Coal).[3]

Emissions Data

  • 2006 CO2 Emissions: 909,828 tons
  • 2006 SO2 Emissions:
  • 2006 SO2 Emissions per MWh:
  • 2006 NOx Emissions:
  • 2005 Mercury Emissions:

The following table gives more info on this plant's SO2 emissions levels, as well as on whatever SO2 emissions "scrubbers" (Flue Gas Desulfurization units, or FGDs) have been installed at the plant. Each of the plant's units is listed separately, and at the bottom overall data for the plant is listed.[4][5]

Unit # Year Built Capacity MWh Produced (2005) SO2 Emissions (2005) SO2 Emissions per MWh (2005) Average Annual Coal Sulfur Content FGD Unit Type FGD In-Service Year FGD SO2 Removal Efficiency
Total 1958 598 MW 2,796,588 MWh 23,366 tons 16.71 lb./MWh 0.83% none installed

Death and disease attributable to fine particle pollution from Allen S. King Generating 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.[6] 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.[7]

Table 1: Death and disease attributable to fine particle pollution from Allen S. King Generating Plant

Type of Impact Annual Incidence Valuation
Deaths 10 $69,000,000
Heart attacks 15 $1,700,000
Asthma attacks 160 $8,000
Hospital admissions 7 $160,000
Chronic bronchitis 6 $2,700,000
Asthma ER visits 10 $4,000

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

Articles and Resources


  1. "Xcel's new plan: Coal-free by 2030, nuclear until 2040," MPR News, May 20, 2019
  2. "Xcel 10-k filing 2019", accessed June 17 2020.
  3. "EIA 923 July 2020" EIA 923 July 2020.
  4. Coal Power Plant Database, National Energy Technology Laboratory, U.S. Dept. of Energy, 2007.
  5. EIA-767, Energy Information Administration, 2005.
  6. "The Toll from Coal: An Updated Assessment of Death and Disease from America's Dirtiest Energy Source," Clean Air Task Force, September 2010.
  7. "Technical Support Document for the Powerplant Impact Estimator Software Tool," Prepared for the Clean Air Task Force by Abt Associates, July 2010

Additional data

To access additional data, including an interactive map of coal-fired power stations, a downloadable dataset, and summary data, please visit the Global Coal Plant Tracker on the Global Energy Monitor website.