POWER OF ATTORNEY

         Know all by these presents, that the undersigned, Bobby J. Griffin,
hereby constitutes and appoints each of Roger E. Schwed and Joli Lyn Gross of
United Rentals, Inc. (the "Company") and Frank Aquila and Andrew Soussloff of
Sullivan & Cromwell LLC ("Sullivan & Cromwell"), each signing singly, the
undersigned's true and lawful attorney-in-fact to:

         (1)      execute for and on behalf of the undersigned the Form ID
                  application required to be filed with the U.S. Securities and
                  Exchange Commission (the "SEC") in order to obtain SEC EDGAR
                  filing codes (the "Form ID");

         (2)      execute for and on behalf of the undersigned, in the
                  undersigned's capacity as an officer and/or director of the
                  Company, Forms 3, 4, and 5, and any amendments thereto (the
                  "Section 16 Reports"), in accordance with Section 16(a) of the
                  Securities Exchange Act of 1934 and the rules thereunder (the
                  "Section 16 Law"); and

         (3)      do and perform any and all acts for and on behalf of the
                  undersigned which may be necessary or desirable to complete
                  and execute the Form ID and any such Section 16 Reports, and
                  file (or cause to be filed) the same with the SEC.

         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 attorney-in-fact, in serving in such capacity at the request of the
undersigned, is not assuming, nor is the Company or Sullivan & Cromwell
assuming, any of the undersigned's responsibilities to comply with the Section
16 Law.

         This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file any Section 16 Reports 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 attorney-in-fact; provided, however, that if any person named
as attorney-in-fact ceases to be associated with the Company or Sullivan &
Cromwell, as the case may be, this Power of Attorney will automatically be
revoked with respect to such person.

         IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 17th day of January 2009.


                           Signature:   /s/ Bobby J. Griffin
                                        ----------------------------------------

                           Print Name:  Bobby J. Griffin
                                        ----------------------------------------