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 Stephanie Zapata Moore
("Reporting Person") granted by that certain Confirming Statement
entered into as of October 6, 2020, 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
Stephanie Zapata Moore
    Name: Yuki Whitmire