Iowa is a leader in both corn production and the milling of corn into ethanol. As of April 2007, Iowa had 23 corn ethanol plants and 20 more plants in construction and planning stages. In 2006, approximately 650 million bushels of Iowa corn was milled by corn ethanol plants. The primary coproduct of dry milling ethanol plants is distillers dried grains with solubles (DDGS). In Iowa, the primary grain used is corn that is fermented and alcohol is collected by distillation.
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