KNOW ALL PERSONS BY THESE PRESENTS that WEST STREET ENERGY
PARTNERS OFFSHORE - 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 - 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