Sentences with phrase «sulfur subbituminous coal»
The mix of rank and origin of coal consumed in the United States has changed substantially in the past two decades, reflecting shifts to Western low - sulfur subbituminous coal and lignite, predominantly for electricity generation.
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Further changes are expected in the coming years, especially due to the Clean Air Act Amendments of 1990, which will encourage switches from high - sulfur Eastern bituminous coal to low - sulfur Western subbituminous coal.