Green Plains Renewable Energy has announced that Agra Industries will be the builder for its second 50 million gallon ethanol plant in Iowa. The company is currently building a 50 million gallon facility in Shenandoah, Iowa. The second plant will be located near Superior. With the two plants, GPRE expects to have the capacity to produce at least 110 million gallons of ethanol on an annual basis by the end of 2007.