Dave Rannetsberger, maintenance superintendent at Taconite Harbor Energy Center in Schroeder, Minn., points out the new additions to a boiler that enable it to burn coal more cleanly, during a tour of the energy plant in this Oct. 2, 2007, file photo. Pollution Control Agency Commissioner John Link Stine praised Duluth-based Minnesota Power and Twin Cities-based Xcel Energy for their effort to cut back on mercury. (2007 file / News Tribune)
Read the article: Minnesota coal plants cut mercury in half
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