LIMITED POWER OF ATTORNEY

                          (ATTORNEY-IN-FACT TO EXECUTE
                     SEC FORM 3, FORM 4 and FORM 5 FILINGS)

KNOW ALL MEN BY THESE PRESENTS:

        THAT the undersigned individual, as an Officer of Energy Transfer
Partners, L.L.C., the general partner of Energy Transfer Partners GP, L.P., the
General Partner of Energy Transfer Partners, L.P., a Delaware limited
partnership, is required pursuant to the provisions of Section 16 of the
Securities Exchange Act of 1934 (the "Act") to make certain reports to the
Securities and Exchange Commission, including the filing of reports on Form 3,
Form 4 and Form 5, and does hereby make, constitute and appoint Peggy J.
Harrison, as his true and lawful attorney, for him, and in his name, place and
stead, to sign on his behalf such Form 3, Form 4 and Form 5 reports, giving and
granting to said attorney full power and authority to do and perform all and
every act and thing whatsoever requisite, necessary and proper to be done in the
premises, as fully, to all intents and purposes, as she might or could do,
hereby ratifying and confirming all that his attorney shall lawfully do or cause
to be done, by virtue hereof.

        The power of attorney granted herein shall expire on the earlier of the
date on which the undersigned individual ceases to be subject to the reporting
requirements of Section 16 of the Act or until revoked.

        IN WITNESS WHEREOF, the undersigned has subscribed her name hereto this
29th day of October, 2007.

                                        /s/ Thomas P. Mason
                                        ----------------------------------------
                                        THOMAS P.MASON

STATE OF TEXAS   )
                 ) ss.
COUNTY OF HARRIS )

        Before me, the undersigned, a Notary Public in and for said County and
State, on this 29th day of October, 2007, personally appeared Thomas P. Mason,
to me known to be the identical person who subscribed his name to the foregoing
Power of Attorney, and he acknowledged to me that he executed the same as his
free and voluntary act and deed, for the uses and purposes therein set forth.

        Given under my hand and seal of office the day and year last above
written.

                                        /s/ Keegan Farrell
                                        ----------------------------------------
                                        Notary Public

My Commission Expires: October 23, 2009

        [Notarial Seal]