Hyperion touts steps to lower South Dakota refinery's emissions - KTIV News 4 Sioux City IA: News, Weather and Sports

ELK POINT, S.D. (KTIV) - Recent changes made to plans for a $10-billion oil refinery to be built in Union County, South Dakota, will lower the facility's emissions. That's according to the company behind the project. 

In a release, Hyperion Refining vice president Preston Phillips said as consultants prepared a request for an extension to the plant's air quality permit, they made modifications to the plant's plans. Among them... use of a lower-carbon fuel gas as the plant's primary fuel. Phillips says that cuts carbon dioxide emissions by 400,000 tons a year. And, the reconfiguration of how the facility's sulfur recovery plant works, which cut emissions of both carbon dioxide, and sulfur dioxide.

The move comes almost a year to the day that Hyperion filed an appeal objecting to limits placed on carbon monoxide emissions. Back then, Phillips said "there's no evidence the limit can be achieved 24-7 every day of the year."