Exhibit II

to

Schedule 13G

Joint Filing Agreement

The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G dated October 10, 2012 in connection with their beneficial ownership of Renewable Energy Group Inc. Columbia Management Investment Advisers, LLC authorizes Ameriprise Financial, Inc. to execute the Schedule 13G to which this Exhibit is attached and make any necessary amendments thereto.

Ameriprise Financial, Inc.
By:	/s/ Wade M. Voigt
	Wade M. Voigt
	Vice President – Fund Administration – Financial Reporting
Columbia Management Investment Advisers, LLC
By:	/s/ Amy Johnson
	Amy Johnson
	Chief Operating Officer