Information Services - May 2011 Press Releases


DENR Responds to Comments, Amends Draft Air Quality Permit Conditions for Hyperion Energy Center



DENR Responds to Comments, Amends Draft

Air Quality Permit Conditions for Hyperion Energy Center


FOR IMMEDIATE RELEASE: Friday, May 13, 2011

FOR MORE INFORMATION: Kim Smith, (605) 773-3153


PIERRE, S.D. - The South Dakota Department of Environment and Natural Resources (DENR) has responded to comments received during a recent public comment period and amended Hyperion’s draft Prevention of Significant Deterioration preconstruction air quality permit.


DENR received comments from approximately 350 individuals, businesses, local governments, environmental groups, and federal government agencies during the extended public comment period that ended April 1.


DENR’s Response to Comments, dated May 2, was mailed to each entity that submitted comments together with a copy of the final draft permit showing the changes that resulted from incorporating applicable comments.  DENR’s mailing opened a 30-day period for those who commented to petition to become a formal party to a contested case hearing set to begin July 25.


Copies of the department’s 80-page Response to Comments and amended Air Quality Permit are available on DENR’s website at Copies of other documents related to draft Hyperion air quality permit conditions and Hyperion’s request for extension are available at


For those without Internet access, copies are available for viewing at DENR’s offices in Pierre or in the Akeley-Lawrence Science Center, University of South Dakota, 414 East Clark, Vermillion, S.D. Copies are also available by writing to DENR’s Pierre office at 523 East Capitol, Joe Foss Building, Pierre, SD, 57501, or calling Kyrik Rombough, DENR Natural Resources Engineering Director, at 605-773-3151.


In August 2009, DENR’s Board of Minerals and Environment issued Hyperion a preconstruction air quality permit. With issuance of the permit, Hyperion was authorized to begin construction of the Hyperion Energy Center in Union County. It will consist of a petroleum refinery and an integrated gasification, combined-cycle power plant that will process an average of 400,000 barrels per day of crude oil.


However, Hyperion notified DENR that it would not begin construction by the Feb. 20, 2011, deadline specified in the permit. Therefore, Hyperion submitted a request on June 23, 2010, to extend the construction deadline. The request also included other updates such as air quality modeling reviews showing compliance with EPA’s new one-hour National Ambient Air Quality Standards for nitrogen dioxide and sulfur dioxide, inclusion of a coker quench water tank, and analyses of the Best Available Control Technology for the permitted equipment and greenhouse gas emissions.


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