KNOW ALL PERSONS BY THESE PRESENTS that WEST STREET ENERGY
PARTNERS OFFSHORE HOLDING - B AIV-1, L.P. (the "Company") does
hereby make, constitute and appoint each of Jamison Yardley and
Nathan R. Burby, acting individually, its true and lawful
attorney, to execute and deliver in its name and on its behalf
whether the Company is acting individually or as representative
of others, any and all filings required to be made by the
Company under the Securities Exchange Act of 1934, (as amended,
the "Act"), with respect to securities which may be deemed to be
beneficially owned by the Company under the Act, giving and
granting unto each said attorney-in-fact power and authority to
act in the premises as fully and to all intents and purposes as
the Company might or could do if personally present by one of
its authorized signatories, hereby ratifying and confirming all
that said attorney-in-fact shall lawfully do or cause to be done
by virtue hereof.

THIS POWER OF ATTORNEY shall remain in full force and effect
until the earlier of (i)
November 3, 2022 and (ii) such time that it is revoked in writing
by the undersigned; provided that in the event the
attorney-in-fact ceases to be an employee of the Company or its
affiliates or ceases to perform the function in connection with
which he/she was appointed attorney-in-fact prior to such time,
this Power of Attorney shall cease to have effect in relation to
such attorney-in-fact upon such cessation but shall continue in
full force and effect in relation to any remaining
attorneys-in-fact. The Company has the unrestricted right
unilaterally to revoke this Power of Attorney.

This Power of Attorney shall be governed by, and construed in
accordance with, the laws of the State of New York, without
regard to rules of conflicts of law.

IN WITNESS WHEREOF, the undersigned has duly subscribed these
presents as of November 4, 2019.


WEST STREET ENERGY PARTNERS OFFSHORE HOLDING - B AIV-1, L.P.

By: Broad Street Energy Advisors AIV-1, L.L.C.,
its General Partner




/s/ William Y. Eng
Name: William Y. Eng
Title: Vice President