POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and appoints
each of Stephanie Zapata Moore, Carrie Lee Kirby, Greg Santos, and Seth
Rasmussen and their successors in office and designees, signing singly, the
undersigned's true and lawful attorney-in-fact to:

(1)     execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of Vistra Energy Corp. (the "Company"),
Forms 4 and 5, in accordance with Section 16(a) of the Securities Exchange Act
of 1934 and the rules and thereunder;

(2)     do and perform any and all other acts for an don behalf of the
undersigned which may be necessary or desirable to complete and execute any such
Form 4 or Form 5, complete and execute any amendment or amendments thereto, and
timely file such form with the SEC and any stock exchange or similar authority;
and

(3)     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 property 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 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, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.

The Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 4 and 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 21st day of May, 2019.


                                         /s/ Brian K. Ferriaoli
                                         Signature


                                         Brian K. Ferriaoli
                                         Print Name