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: July 22, 2026	MDEQ Contact: Clinton Gentry

Tennessee Gas Pipeline Company LLC ("TGP"), Bay St Louis Compressor Station Number 530, located at 10064 Lower Bay Road, in Bay St. Louis, MS, (228) 467-9284, has applied to the Mississippi Department of Environmental Quality (MDEQ) for the following permitting action(s): Issuance of an Air Permit to Construct, Ref. No. 1000-00017. A Permit Review Summary 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 Permit Review Summary also addresses the changes to emissions resulting from the modification of the facility.  
Natural gas compression at the Bay St. Louis Compressor Station is currently accomplished through the use of eight (8) natural gas-fired compressor engines rated at 2,000 horsepower (hp) each and one (1) compressor turbine rated at 9,100 hp. The applicant's operations fall within SIC Code 4922 for Natural Gas Transmission.  TGP is proposing to construct a 24,000 hp Solar Titan 130 Model natural gas-fired turbine, which would eventually replace some of the existing compressor engines. Additionally, TGP will install a 1,500 kilowatt (kW) natural gas-fire emergency generator and a 2.074 MMBtu/hr catalytic fuel gas heater.
Since TGP is currently a major stationary source with regards to the Prevention of Significant Deterioration (PSD) regulations, the project to construct the new turbine and associated equipment was evaluated under the PSD regulations in 40 CFR 52.21, as adopted by reference in 11 Miss. Admin. Code Pt. 2, Ch. 5. Using the actual-to-potential applicability test in 40 CFR 52.21(a)(2)(iv)(D) for projects only involving construction of new sources, TGP determined that the project is not considered a major modification since the emissions changes do not exceed the significant emissions rates (SER) in 40 CFR 52.21(b)(23). However, to avoid being a major modification for NOx, TGP proposes to limit emissions of NOx from the turbine to the manufacturer’s guaranteed rate, and, therefore, the project is considered a moderate modification and required to obtain a permit to construct.
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 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 its consideration of key aspects of the permit action. 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.