Dickerson Generating Station

From Global Energy Monitor

Dickerson Generating Station is an operating power station of at least 326-megawatts (MW) in Dickerson, Montgomery, Maryland, United States with multiple units, some of which are not currently operating.


Table 1: Project-level location details

Plant name Location Coordinates (WGS 84)
Dickerson Generating Station Dickerson, Montgomery, Maryland, United States 39.209267, -77.464028 (exact)

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

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Unit-level coordinates (WGS 84):

  • Unit 1, Unit 2, Unit 3: 39.209267, -77.464028
  • Unit GT2, Unit GT3: 39.2097, -77.4644

Project Details

Table 2: Unit-level details

Unit name Status Fuel(s) Capacity (MW) Technology CHP Start year Retired year
Unit 1 retired coal - bituminous 196 subcritical 1959 2020
Unit 2 retired coal - bituminous 196 subcritical 1960 2020
Unit 3 retired coal - bituminous 196 subcritical 1962 2020
Unit GT2 operating[1] gas, fuel oil[2] 163[1] gas turbine[1] no[1] 1992[1]
Unit GT3 operating[1] gas, fuel oil[2] 163[1] gas turbine[1] no[1] 1992[1]

CHP is an abbreviation for Combined Heat and Power. It is a technology that produces electricity and thermal energy at high efficiencies. Coal units track this information in the Captive Use section when known.

Table 3: Unit-level ownership and operator details

Unit name Owner Parent
Unit 1 Lanyard Power Holdings LLC [100.0%]
Unit 2 Lanyard Power Holdings LLC [100.0%]
Unit 3 Lanyard Power Holdings LLC [100.0%]
Unit GT2 Dickerson Power, LLC[3] Dickerson Power, LLC [100.0%]
Unit GT3 Dickerson Power, LLC[3] Dickerson Power, LLC [100.0%]

Unit Retirement

In December 2013, NRG Energy signaled that it plans to retire the Chalk Point Generating Station and Dickerson Generating Station in May 2017.[4]

In May 2015 NRG asked PJM Interconnection for a delay to May 2019 in the deactivation dates for Dickerson and Chalk Point.[5]

In February 2016, NRG withdrew its de-activation notice for Dickerson coal fired units, which are now slated to operate indefinitely.[6]

On May 15, 2020 GenOn Holdings announced it will be retiring the 3 coal units at the plant and filed a deactivation notice with PJM. Deactivation was subject to PJM's 90 days reliability review period after which the company will initiate the deactivation process.[7] The 3 units were eventually retired on August 13, 2020.[8]

Coal Deliveries

According to the EIA 923 coal sales database the last delivery of coal to the Dickerson Generationg Station was in January 2019. The coal units not officialy retired but its looks like all 3 units are idled or already shut down and only the natural gas units are producing power.


The Dickerson plant began service in 1959.[9] All of the generating plants were built by the Potomac Electric Power Company, which sold them to the Southern Company in December 2000 as a result of the restructuring of the electricity generating industry in Maryland. The station was included in the corporate spin-off from the Southern Company of Mirant in April 2001. Mirant was merged into GenOn Energy Holdings in 2010,[10] and GenOn merged into NRG in 2012.[11] In 2018 GenOn emerged from bankruptcy and re-acquired the Dickerson Generating Station from NRG Energy.[12]

Clean Air Settlement

On May 8, 2006 Mirant Mid-Atlantic (Mirant) agreed to eliminate nearly 29,000 tons of harmful pollution each year that is produced by its four coal-fired electrical plants in Maryland and Virginia as a result of allegations that the company had violated New Source Review requirements of the Clean Air Act. The U.S. EPA, Department of Justice and the states of Virginia and Maryland worked on a joint settlement agreement, which sought to reduce the output of nitrogen oxides (NOx) from the four plants.

Under settlement terms, Mirant will cap NOx emissions on a system-wide basis from its Chalk Point Generating Station in Maryland, Dickerson Generating Station in Maryland, Morgantown Generating Station in Maryland, and its Potomac River Generating Station in Virginia. To meet these objectives Mirant will install pollution control equipment at its Potomac River and Morgantown power plants, and may also install controls at their other sites. According to Mirant, the company will be installing Flue gas desulfurization (scrubbers) to reduce sulfur dioxide (SO2) that will be operable by 2010.[13] The EPA notes that Mirant will install and operate two Selective Catalytic Reduction devices to control for NOx emissions at its Morgantown facility, as well as Separated Over-Fire Air technology at the Potomac plant.

Mirant also paid a $500,000 civil penalty, which was divided between Virgina and the U.S. government. Additionally, Mirant will spend at least $1 million on nine separate projects to reduce fine particulate matter (PM) from its Potomac River Generating Station.

"The reductions in NOx emissions required by this settlement will result in general improved air quality throughout the metropolitan area and the surrounding region," said Sue Ellen Wooldridge, assistant attorney general for the Justice Department's Environment and Natural Resources Division. "Today's settlement is evidence of the continued progress that we are achieving through the cooperative enforcement efforts of federal and state agencies."

NOx contributes to the formation of acid rain and also increases low-level ozone, which causes smog, and fine PM causes haze.[14]

Emissions Data

  • 2006 CO2 Emissions: 3,249,702 tons
  • 2006 SO2 Emissions: 35,954 tons
  • 2006 SO2 Emissions per MWh:
  • 2006 NOx Emissions: 5,040 tons
  • 2005 Mercury Emissions: 270 lb.

Death and disease attributable to fine particle pollution from Dickerson

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.[15] 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.[16]

Table 1: Death and disease attributable to fine particle pollution from Dickerson Generating Station

Type of Impact Annual Incidence Valuation
Deaths 32 $230,000,000
Heart attacks 53 $5,800,000
Asthma attacks 520 $27,000
Hospital admissions 25 $580,000
Chronic bronchitis 20 $8,700,000
Asthma ER visits 25 $9,000

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

Articles and Resources


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 "U.S. Energy Information Administration, Preliminary Monthly Electric Generator Inventory (November 2019)". Archived from the original on June 12, 2020. Retrieved September 10, 2021.
  2. 2.0 2.1 "U.S. Energy Information Administration, Preliminary Monthly Electric Generator Inventory (July 2021)". Archived from the original on November 22, 2021. Retrieved October 13, 2021.
  3. 3.0 3.1 "U.S. Energy Information Administration, Preliminary Monthly Electric Generator Inventory (November 2022)". Archived from the original on January 22, 2023. Retrieved December 23, 2022.
  4. "Chalk Point and Dickerson coal plants set to retire," Dec 6, 2013.
  5. "NRG delays planned deactivations for five Maryland coal units for another year," Generation Hub, May 1, 2015
  6. "SEC Form 10-K, NRG Energy, Inc". Securities and Exchange Commission. 2016-01-31.
  7. "GenOn Holdings, Inc. Announces Retirement of Dickerson Coal Plant" Genon.com, May 15, 2020.
  8. "PJM Generation Deactivations" PJM, accessed August 13, 2020
  9. Mirant Corporation. "Dickerson Generating Plant." Accessed 2010-05-24.
  10. de la Merced, Michael J. (2010-04-12). "Merger of Energy Producers To Form $3 Billion Company". New York Times.
  11. de la Merced, Michael J. (2012-07-23). "NRG Energy to Buy GenOn in Move to Bolster Stocks and Cut Costs". New York Times.
  12. "Our Locations," GenOn, accessed April 2019
  13. "Chalk Point Generating Plant," Mirant's Chalk Point Generating Plant, accessed November 6, 2009
  14. "Clean Air Act Settlement to Eliminate Almost 29,000 Tons of Harmful Emissions in Virginia and Maryland," U.S. EPA, May 8, 2006
  15. "The Toll from Coal: An Updated Assessment of Death and Disease from America's Dirtiest Energy Source," Clean Air Task Force, September 2010.
  16. "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 interactive maps of the power stations, downloadable datases, and summary data, please visit the Global Coal Plant Tracker and the Global Oil and Gas Plant Tracker on the Global Energy Monitor website.