Prices have gained 30 percent this year on hotter-than normal weather from California to New York. Demand from utilities increased amid stiffer federal scrutiny of the mining industry after the Massey Energy Co. disaster on April 5 curbed operations in Appalachia, home to 33 percent of U.S. coal production. Output has dropped 6.9 percent in the past 12 months, Energy Department data show.
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