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December 21, 2023



Edmund Baker
Environmental Program Director
MHA Nation
404 Frontage Road
New Town, North Dakota  58763
edmundbaker@mhanation.com  

Re: Crusoe Energy Systems, Inc., Crosby Chase Central Tank Battery, Permit # SMNSR-TAT-008149-2023.002, Proposed Revised Minor New Source Review Permit

Dear Edmund Baker:

The U.S. Environmental Protection Agency Region 8 is proposing to issue a revised permit in accordance with the Tribal Minor New Source Review (MNSR) Permit Program at 40 CFR part 49, for Crusoe Energy Systems, Inc.'s existing Crosby Chase Central Tank Battery data center facility. The purpose of the proposed revised permit is to modify certain permitted emissions units and associated emissions limits and operational limits and establish the facility as a synthetic minor source of criteria air pollutants with respect to the Prevention of Significant Deterioration Permit Program at 40 CFR part 52 and the title V Operating Permit Program at 40 CFR part 71. Specifically, Crusoe requested to remove the existing field gas-fired compressor engine and field gas-fired compressor turbine, add six additional field gas-fired generator engines, for a total of seven generator engines, and modify the existing enforceable permit limitations to reflect the changes. 

A public comment period for the proposed permit will begin on December 22, 2023, and end on January 22, 2024. 

The proposed permit and supporting documents are available in the electronic docket at regulations.gov (Docket ID # EPA-R08-OAR-2023-0443), and we ask you that you please assist members of the public who contact you with instructions on how to access the material available for public review until the end of public comment period. Comments may be submitted via mail, via email to R8AirPermitting@epa.gov, or through https://www.regulations.gov (Docket ID #EPA-R08-OAR-2023-0443). In addition, we have provided an electronic copy of the bulletin board public notice announcement and would appreciate it if you could post this announcement in prominent locations in your area. All of these documents will also be available for review in electronic format on our website at: https://www.epa.gov/caa-permitting/caa-permit-public-comment-opportunities-region-8.  
If you have any questions concerning the proposed permit or technical support document, please contact Claudia Smith at (303) 312-6520 or at smith.claudia@epa.gov.   


Sincerely,


                                    
Adrienne Sandoval
Director, Air and Radiation Division


Enclosure (email attachment) 
1.Bulletin Board Notice  -  Crusoe Crosby Chase CTB Proposed MNSR Revision.pdf 
