Wed Jun 3, 2015 11:52 AM CDT

MINNEAPOLIS (DTN) -- The confusion the U.S. Environmental Protection Agency has created on the Renewable Fuel Standard has been enough to force advanced biofuels companies to make decisions they may not have made otherwise.

Although these companies remain optimistic about the future of the industry, the expansion of their operations has been slowed in the United States because of RFS doubts, representatives from a number of cellulosic ethanol companies said during a panel discussion Tuesday at the International Fuel Ethanol Workshop in Minneapolis.

A case in point: Abengoa Bioenergy's recent launch of its first-generation cellulosic ethanol plant in Hugoton, Kansas, ...

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