SIOUXLAND—Hyperion Resources has informed the state that a proposed oil refinery in southeast South Dakota would release almost double the amount of the greenhouse gas methane over its previous estimate. Documents from the Department of Environment and Natural Resources show that previous estimates omitted coke drum steam vents from its refining process. The Argus Leader reports that new estimates revise the plant’s expected methane emissions from 498 tons per year to 979 tons. South Dakota in August 2009 granted an air quality permit for the $10 billion refinery, but the Sierra Club and two local groups are seeking to have it overturned. Hyperion officials have said they expect the permit to be in place next year, and they expect to start construction.


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