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
Stephen J. Muscato ("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 Stephen J. Muscato
    Name: Yuki Whitmire