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As one of the older plants on this list, Duke Energy’s Gallagher Generating Station is also one of the dirtiest. Located along the banks of the Ohio River in Floyd County, Indiana, Gallagher stores coal fly ash in ponds on the banks of the Ohio River. But the relatively small 600-megawatt Gallagher station made the list mostly because it emits 50,819 tons of sulfur dioxide (SO2) annually—a ratio of about 4o pounds per megawatt-hour—the highest of any plant in the United States.