Public Notice
Mississippi Environmental Quality Permit Board
P. O. Box 2261 | Jackson, MS 39225
515 East Amite St. | Jackson, MS 39201
Telephone No. (601) 961-5171

Public Notice Start Date: September 24, 2025	MDEQ Contact: Clinton Gentry

Entergy Mississippi LLC, Vicksburg Advanced Power Station (VAPS), located at 770 Kemp Bottom Road in Vicksburg, MS, has applied to the Mississippi Department of Environmental Quality (MDEQ) for the following permitting action(s): Prevention of Significant Deterioration (PSD) Construction Permit, Air Ref. No. 2780-00027. The applicant's operations fall within SIC Code 4911.  A Statement of Basis has been prepared that contains a discussion of the decision-making that went into the development of the permit and provides the permitting authority, the public, and other government bodies a record of the technical issues surrounding issuance of the permit. The Statement of Basis also addresses any changes to emissions and/or discharges resulting from any modification of the facility.  
Entergy Mississippi, LLC (Entergy) submitted a PSD Construction application proposing to build a new natural gas-fired 1x1 combined cycle power plant in Vicksburg, MS which will be referred to as the Vicksburg Advanced Power Station (VAPS). This plant will be nominally rated to provide 750 megawatts (MW) of net power.
The power generation equipment proposed for DBAPS includes a Mitsubishi Model M501JAC Gas Turbine (GT) equipped with supplementary-fired duct burners and a Heat Recovery Steam Generator (HRSG). In addition to power from a generator turned by the gas turbine shaft, additional power is supplied by a generator turned by a steam turbine which is fed steam generated in the HRSG. The proposed facility will have other ancilllary sources of air pollution which include: one diesel-fired emergnecy standby generator, one diesel-fired firewater pump, one natural gas fired heater, natural gas fugitive emisisons, ammonia fugitive emissions, diesel fugitive emissions, combustion turbine lube oil vent emissions, steam turbine lube oil vent emissions, two ultra low sulfur diesel (ULSD) storage tanks for the emergency generator and the fire water pump. 
This project has potential emisisons that exceed the PSD thresholds for Nitrogen Oxides (NOX), Carbon Monoxide (CO), Volatile Organic Compounds (VOCs), Particulate Matter (PM10 and PM2.5), Sulfuric Acid Mist (H2SO4), and Greenhouse Gasses (GHG). For PM10 and NOX which set certain requirements on the permissible incremental impact on air quality and the degree of control of air contaminants and has been reviewed for compliance with those regulations.  The project will be located in a PSD Class II area, and the following consumption of air quality increments is predicted to occur:
 Particulate Matter Less than 10 microns
	Annual	0.1193 micrograms per cubic meter or 
		0.7% of the 17 micrograms per cubic meter increment.
	24-Hour	1.374 micrograms per cubic meter or
		4.58% of the 30 micrograms per cubic meter increment.
Nitrogen Dioxide
	Annual	0.8639 micrograms per cubic meter or 
		3.46% of the 25 micrograms per cubic meter increment.  
The staff of the Permit Board has developed this draft permit based on information submitted to the Permit Board by the applicant, appropriate State and Federal agencies and other interested parties. The staff of the Permit Board is soliciting all relative information pertaining to the proposed activity, including public comment, to ensure that the final staff recommendation on the draft permit complies with all State and Federal regulations. Public review and comment on the draft permit and supporting documentation is an important element in the staff evaluation and resulting recommendation to the Permit Board. The draft permit conditions have been developed to ensure compliance with all State and Federal regulations but are subject to change based on information received as a result of public participation.
Persons wishing to comment upon or object to the proposed determinations are invited to submit comments in writing to Clinton Gentry at https://www.mdeq.ms.gov/Gentry-Clinton/ or to the Permit Board address shown above, no later than the end of the thirty (30) day public notice. All comments received by this date will be considered in the formulation of final determinations regarding the application(s).  A public hearing will be held if the Permit Board finds a significant degree of public interest in the proposed permit(s). Persons wishing to request a public hearing may do so by submitting that request in writing to Clinton Gentry at https://www.mdeq.ms.gov/Gentry-Clinton/ or to the Permit Board address shown above.  The Permit Board is limited in the scope of its analysis to environmental impact.  Any comments relative to zoning or economic and social impacts are within the jurisdiction of local zoning and planning authorities and should be addressed to them.
Additional details about the application, including a copy of the draft permit, are available by writing or calling the Public Records Request Officer at the above Permit Board address and telephone number or by completing the form at the following website:  https://www.mdeq.ms.gov/about-mdeq/public-records-request/public-records-request-form/.  Additionally, a copy of the draft permit and statement of basis may be found on the MDEQ’s website at: https://opc.deq.state.ms.us/publicnotice.aspx. This information is also available for review at the office of the MDEQ at the Permit Board address shown above during normal business hours. Please bring the foregoing to the attention of persons whom you know will be interested.