CONFIRMING STATEMENT

This Confirming Statement ("Statement") confirms
that the undersigned, Yuki Whitmire, pursuant to her
power and authority in her role as attorney-in-fact for
Stacey H. Dore ("Reporting Person") granted by that certain
Power of Attorney entered into as of August 26, 2022, hereby
authorizes, directs and designates Daniela Gutierrez ("Designee"),
acting singly, to: (1) prepare, execute in the Reporting
Person's name and on the Reporting Person's behalf, and
submit to the U.S. Securities and Exchange Commission
(the "SEC") a Form ID, including amendments thereto,
and any other documents necessary or appropriate
to obtain codes and passwords enabling the undersigned to
make electronic filings with the SEC of reports required
by Section 16(a) of the Securities Exchange Act of 1934
("Exchange Act") or any rule or regulation of the SEC;
(2) execute for and on behalf of the Reporting Person, in the
Reporting Person's capacity as an officer and/or
director of Vistra Corp. (the "Company"), Forms 3, 4, and 5
in accordance with Section 16(a) of the Exchange Act
and the rules thereunder; (3) do and perform any and all
acts for and on behalf of the Reporting Person which
may be necessary or desirable to complete and execute
any such Form 3, 4, or 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 (4) take any other action of any type whatsoever
in connection with the foregoing which, in the opinion of the
Designee, may be of, benefit to, in the best interest of,
or legally required by, the Reporting Person, it
being understood that the documents executed by the
Designee on behalf of the Reporting Person pursuant
to this Statement shall be in such form and shall contain
such terms and conditions as the Designee may approve in the
Designee's discretion.

The undersigned, pursuant to her power and authority in
her role as attorney-in-fact
for the Reporting Person, hereby grants to the
Designee 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 granted under this Statement,
as fully to all intents and purposes as the Reporting Person
might or that the Designee, or the Designee's substitute or
substitutes, shall lawfully do or cause to be done by
virtue of this Statement and the rights and powers herein
granted. On behalf of the Reporting Person, the
undersigned acknowledges that the foregoing Designee, in serving
in such capacity on behalf of the Reporting Person,
is not assuming, nor is the Company assuming,
any of the Reporting Person's responsibilities
to comply with Section 16 of the Exchange Act.

The authority of the Designee under this Statement
shall continue until the
Reporting Person is no longer
required to file Forms 3, 4, and 5 with respect
to the Reporting Person's holdings of
and/or transactions in securities of the
Company, unless earlier revoked by the Reporting Person,
or any attorney-in-fact,
in a signed writing delivered to the Designee.

IN WITNESS WHEREOF, the undersigned has caused this Statement to be
executed as of this 26th day of February, 2024.

By: /s/ Yuki Whitmire, as attorney-in-fact for Stacey H. Dore
    Name: Yuki Whitmire