LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS

      Know all by these presents, that the undersigned hereby constitutes
and appoints each of Carolyn M. Campbell, Brett A. Schrader , Joshua S.
Chaffin, and Matthew D. McCoy 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 a director and/or officer of Quanta Services,
Inc. (the "Company"), Forms 3, 4, and 5 in accordance with Section 16(a)
of the Securities Exchange Act of 1934, as amended, and the rules
thereunder;
      (2) do and perform any and all acts for and on behalf of the
undersigned 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 United States Securities and
Exchange Commission 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 Limited
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 proper 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 could do if personally present, with
full power of substitution or revocation, hereby ratifying and confirming
all 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, as amended.
      This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 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. The
undersigned acknowledges that the execution of this Limited Power of
Attorney shall automatically revoke all earlier power(s) of attorney
executed by the undersigned in the undersigned's capacity as a director
and/or officer of the Company and in connection with the undersigned's
obligations under Section 16 of the Securities Exchange Act of 1934,
as amended.
      IN WITNESS WHEREOF, the undersigned  has caused this Limited
Power of Attorney  to be executed as of this 27 day of March, 2019.
          /s/ James Redgie Probst