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:  April 15, 2026
Public Notice End Date: April 27, 2026

ADP Rankin Data Hub, LLC (ADP), to be located at 268 East Metro Parkway in Brandon, Ranking County, Mississippi, is requesting an Optional Pre-Permit Construction approval from the Mississippi Department of Environmental Quality (MDEQ) as allowed by the Mississippi Air Permit Regulations 11 Miss. Admin. Code Pt. 2, R. 2.15.B.  The facility is publishing this public notice to provide the public with the opportunity to comment to the MDEQ regarding the proposed project.  

The proposed project will be classified under SIC Code 7374: Computer Processing and Data Preparation and Processing Services.  ADP is proposing to construct the Rankin Data Hub, a large‑scale, AI‑ready data‑processing facility designed to support enterprise and artificial‑intelligence computing workloads. The facility will receive the bulk of its electrical power from the local utility provider; however, diesel‑fired standby generators will be necessary to support operations during emergency events or utility‑requested curtailment. ADP proposes to construct fifty (50) 3‑megawatt (MW) diesel‑fired emergency standby generators, distributed evenly across two generator buildings. Each generator will be equipped with a 5,600‑gallon diesel belly tank for on‑site fuel storage. Additional emergency support equipment includes two (2) 175 kW diesel‑fired emergency fire pump engines and one (1) 100 kW propane‑fired emergency generator to support substation controls. All engines will be EPA Tier II certified emergency engines subject to NSPS Subparts IIII and JJJJ, as applicable.  

The emissions from this project will remain below the Prevention of Significant Deterioration (PSD) thresholds specified in 11 Miss. Admin. Code Pt. 2, Ch. 5, and 40 CFR 52.21. Although the uncontrolled potential to emit (PTE) for the 3 MW engines exceeds the PSD major‑source threshold for nitrogen oxides (NOₓ), ADP proposes federally enforceable limitations and will install advanced add‑on emissions controls—including Selective Catalytic Reduction (SCR), Diesel Oxidation Catalyst (DOC), and Diesel Particulate Filter (DPF) systems—to ensure facility‑wide NOₓ emissions remain below 249 tons per year. Proposed allowable emissions are based on 200 hours per year of uncontrolled operation and 300 hours per year of controlled emergency response, consistent with manufacturer data and EPA guidance. ADP will apply for a Synthetic Minor Operating Permit after the source becomes subject to the permit program which occurs once the uncontrolled potential to emit (PTE) exceeds 100 tpy for any criteria pollutant., as required under 11 Miss. Admin. Code Pt. 2, Ch. 6.

Persons wishing to comment upon or object to the proposed request are invited to submit comments in writing to Chief, Air Division at the Permit Board's address shown above no later than 10-days from the date of publication of this notice.  All comments received or postmarked by this date will be considered in the determination regarding the pre-permit construction approval. After receipt of public comments and thorough consideration of all comments, MDEQ will formulate its recommendations regarding pre-permit construction approval.

Additional details about the application, including a copy of the application, 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/. 
This information is also available for review at the following location during normal business hours:

Mississippi Department of Environmental Quality
Office of Pollution Control
515 East Amite Street
Jackson, MS 39201
(601) 961-5171
   
Please bring the foregoing to the attention of persons whom you know will be interested.