The plant, LG&E's largest, burns about 4 million tons of coal a year that comes mostly from western Kentucky mines owned by Armstrong Coal Company and Alliance Resource Partners. The coal in that region, part of the Illinois Coal Basin, has a higher sulfur content than coal mined in eastern Kentucky and other parts of Appalachia.
LG&E says the upgrades at Mill Creek will remove 98 percent of the sulfur dioxide from the plant's emissions, along with increased removal of mercury. The utility is also halting coal-burning at its Cane Run facility in Jefferson County and converting it to natural gas ahead of the coming EPA regulations.
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