<p>KNOW ALL PERSONS BY THESE PRESENTS that WEST STREET ENERGY<br />
PARTNERS OFFSHORE HOLDING - B AIV-1, L.P. (the "Company")  does<br />
hereby make, constitute and appoint each of Jamison Yardley and<br />
Nathan R. Burby, acting individually, its true and lawful<br />
attorney, to execute and deliver in its name and on its behalf<br />
whether the Company is acting individually or as representative<br />
of others, any and all filings required to be made by the<br />
Company under the Securities Exchange Act of 1934, (as amended,<br />
the "Act"), with respect to securities which may be deemed to be<br />
beneficially owned by the Company under the Act, giving and<br />
granting unto each said attorney-in-fact power and authority to<br />
act in the premises as fully and to all intents and purposes as<br />
the Company might or could do if personally present by one of<br />
its authorized signatories, hereby ratifying and confirming all<br />
that said attorney-in-fact shall lawfully do or cause to be done<br />
by virtue hereof.<br />
 <br />
THIS POWER OF ATTORNEY shall remain in full force and effect<br />
until the earlier of (i)<br />
November 3, 2022 and (ii) such time that it is revoked in writing<br />
by the undersigned; provided that in the event the<br />
attorney-in-fact ceases to be an employee of the Company or its<br />
affiliates or ceases to perform the function in connection with<br />
which he/she was appointed attorney-in-fact prior to such time,<br />
this Power of Attorney shall cease to have effect in relation to<br />
such attorney-in-fact upon such cessation but shall continue in<br />
full force and effect in relation to any remaining<br />
attorneys-in-fact. The Company has the unrestricted right<br />
unilaterally to revoke this Power of Attorney.<br />
 <br />
This Power of Attorney shall be governed by, and construed in<br />
accordance with, the laws of the State of New York, without<br />
regard to rules of conflicts of law.<br />
 <br />
IN WITNESS WHEREOF, the undersigned has duly subscribed these<br />
presents as of November 4, 2019.<br />
 <br />
 <br />
WEST STREET ENERGY PARTNERS OFFSHORE HOLDING - B AIV-1, L.P.<br />
 <br />
By: Broad Street Energy Advisors AIV-1, L.L.C.,<br />
its General Partner<br />
 <br />
 <br />
 <br />
 <br />
/s/ William Y. Eng<br />
Name: William Y. Eng<br />
Title:  Vice President</p>