July 30, 2020

Valero Energy Corporation
P.O. Box 696000
San Antonio, Texas 78269-6000

Attention:  Corporate Secretary

Re:     Section 16 Reporting

The undersigned hereby constitutes and appoints
J. Stephen Gilbert and Ethan A. Jones,
or any of them, each with power to act without the other,
as my true and lawful attorneys-in-fact and agents,
for me in my name, place and stead, to sign and
file any Form ID, Form 3, Form 4, Form 5, or related
instrument, certificate, or document (including
amendments to these forms and documents) required
to be filed by me pursuant to Section 16(a) of the
Securities Exchange Act of 1934, as amended, with
respect to the Common Stock, $.01 par value, and
any other equity securities of Valero Energy
Corporation.  This authority shall remain in full
force and effect until revoked by me in writing.

Each attorney-in-fact and agent is hereby
authorized to file or cause to be filed with the
Securities and Exchange Commission a duplicate
of this letter to serve as confirmation of
the authority of such attorney-in-fact and
agent to file such forms.

Very truly yours,

(signature) Cheryl L. Thomas