Enogen corn rows in a field
Biofuel plant at sunset
U.S. Sen. Chuck Grassley (R-IA) arrives for a vote at the Capitol Sept. 5, 2017, in Washington, DC.
Scott Pruit Bill Couser
Biofuel factory aerial view
Biofuel plant at sunset
Fueling car
Carl Icahn
Biofuel plant at sunset
Ethanol plant beyond field of green