Golden Grain Energy in Mason City has been growing since its inception in 2002. The plant produced 40 million gallons of ethanol annually back then, and now produces more than three times that amount — about 135 million gallons a year.

GGE officials hope a proposed carbon sequestration pipeline helps the company expand even more in the future. Representatives from Summit Carbon Solutions, which wants to build more than 400 miles of pipeline across Iowa, were in Mason City to tour the facilities and answer questions.

The idea is to pipe carbon dioxide to be sequestered more than a mile under the ground in North Dakota. Summit is currently partnered with 32 ethanol and biofuel facilities across North Dakota, Minnesota, Iowa, South Dakota and Nebraska.

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