Chesapeake Energy Corporation owns a natural gas drilling site in Leroy Township, Pa. A drilling boom that began five years ago has tapered off because of a glut of gas on the market. In 2008, natural gas costs reached about $8 per thousand cubic feet. As more rigs went up in Pennsylvania, West Virginia and elsewhere in the ensuing years, the price began to dip its current 10-year low. (Associated Press)
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