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: May 13, 2026	MDEQ Contact: Ryan Wigginton

Compass Datacenters JAN I, LLC, located at I20-59 Industrial Park, in Meridian, MS, (469) 902-2400, has applied to the Mississippi Department of Environmental Quality (MDEQ) for the following permitting action(s): Issuance of the Permit to Construct, Air Ref. No. 1460-00133. The applicant's operations fall within SIC Code 7374.  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.  
Compass Datacenters JAN I, LLC (Compass) has submitted a complete air application for a Permit to Construct Air Emissions Equipment. Compass is proposing to construct a greenfield data processing facility in Meridian (Lauderdale County), Mississippi. Compass’ operations fall under SIC code 7374: Computer Processing and Data Preparation and Processing Services.

The site is referred to as the JANI Site (Site). The Site will include 420 emergency backup electrical power generator engines in various sizes with a total power generation capacity of 813 Megawatts (MW). The emergency backup generator engines will consist of:
•	Four hundred (400) 2,000-Kilowatt (kW) Emergency Backup Electrical Power Generator Engines. Each engine will consist of a 2,937 HP Caterpillar Model 3516C Tier-2 certified emergency generator Compression Ignition (CI) engine.
•	Ten (10) 800-kW Emergency Backup Electrical Power Generators Engines. Each engine will consist of a 1,214 HP Caterpillar Model C27 Tier-2 certified emergency generator CI engine.
•	Ten (10) 500-kW Emergency Backup Electrical Power Generators Engines. Each engine will consist of a 762 HP Caterpillar Model C15 Tier-2 certified emergency generator CI engine.
Each emergency generator engine will be equipped with an associated diesel fuel storage tank
With the proposed emission restrictions in place, Compass’ potential-to-emit (PTE) exceeds the Title V major source threshold of 100 tons per year (tpy) for NOx and CO but for no other criteria air pollutants. The facility’s potential-to-emit hazardous air pollutants (HAPs) falls below the Title V major source thresholds of 25 tpy of total HAPs and 10 tpy for all individual HAPs. Therefore, the facility will operate as a Title V source and an area source for HAPs. Compass is not one of the 28 categorical facilities listed in 40 CFR 52.21(b)(1)(i)(a); therefore, the PSD threshold for a major source is 250 tpy.  Compass has the potential to emit more than 250 tons per year (tpy) of the following regulated NSR pollutants: NOx and CO. However, Compass is proposing to limit emissions of NOx and CO to 249.0 tpy-each; therefore, the facility will be considered a moderate stationary source.
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. 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 Ryan Wigginton at https://www.mdeq.ms.gov/Ozment-Ryan/ 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 Ryan Wigginton at https://www.mdeq.ms.gov/Wigginton-Ryan/ 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.