LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS

      Know all by these present that the undersigned hereby makes, constitutes
and appoints each of Tammy Tompkins and Kimberly Totah, signing singly and each
acting individually, as the undersigned's true and lawful attorney- in-fact with
full power and authority as hereinafter described to:

(1)   execute for and on behalf of the undersigned, in the undersigned's
capacity as a director of Gevo, Inc. (the "Company"), Forms 3, 4, and 5
(including any amendments thereto) in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules thereunder (the "Exchange Act");

(2)   do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to prepare, complete and execute any such Form 3,
4, or 5, or other form or report, prepare, complete and execute any amendment or
amendments thereto, and timely deliver and file such form or report with the
U.S. Securities and Exchange Commission and any stock exchange or similar
authority;

(3)   seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information regarding transactions in the Company's
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such
person to release any such information to such attorney-in-fact and approves and
ratifies any such release of information; and

(4)   take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming or
relieving, nor is the Company assuming or relieving, any of the undersigned's
responsibilities to comply with Section 16 of the Exchange Act.  The undersigned
acknowledges that neither the Company nor the foregoing attorneys-in-fact
assumes (i) any liability for the undersigned's responsibility to comply with
the requirements of the Exchange Act, (ii) any liability of the undersigned for
any failure to comply with such requirements, or (iii) any obligation or
liability of the undersigned for profit disgorgement under Section 16(b) of the
Exchange Act.

      This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, or 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 14th day of March, 2014.


                                                  /s/ Samir Kaul
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                                                  Signature

                                                  Samir Kaul
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                                                  Print Name