EXHIBIT B

Power of Attorney

KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned hereby constitute and appoint Jeremiah J. Ashcroft III, Robert J. McNally and Lewis B. Gardner, and each of them, with full power to act without the other, its true and lawful attorney-in-fact, with full power of substitution, to execute for and on behalf of the undersigned, all Schedule 13Ds (including any amendments thereto) that the undersigned may be required to file as a result of the undersigned’s ownership or transactions in the securities of EQT Midstream Partners, LP (the Partnership) in accordance with Section 13 of the Securities Exchange Act of 1934 and the rules thereunder; 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 Schedule 13D and timely file such form with the United States Securities and Exchange Commission and any stock exchange or similar authority; and 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 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 grant 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 acknowledge that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Partnership assuming, any of the undersigned’s responsibilities to comply with Section 13 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the undersigned are no longer required to file Schedules 13D with respect to the undersigned’s holdings of and transactions in securities issued by the Partnership, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

Dated: May 22, 2018

[Signature Page Follows]

EQT GP HOLDINGS, LP
By: EQT GP Services, LLC, its general partner
By:	/s/ Robert J. McNally
Name:	Robert J. McNally
Title:	Senior Vice President and Chief Financial Officer
EQT GP SERVICES, LLC
By:	/s/ Robert J. McNally
Name:	Robert J. McNally
Title:	Senior Vice President and Chief Financial Officer
EQT GATHERING HOLDINGS, LLC
By:	/s/ Jeremiah J. Ashcroft III
Name:	Jeremiah J. Ashcroft III
Title:	President
RICE MIDSTREAM HOLDINGS LLC
By:	/s/ Jeremiah J. Ashcroft III
Name:	Jeremiah J. Ashcroft III
Title:	President
RICE ENERGY OPERATING LLC
By:	/s/ David E. Schlosser, Jr.
Name:	David E. Schlosser, Jr.
Title:	President
EQT RE, LLC
By:	/s/ David E. Schlosser, Jr.
Name:	David E. Schlosser, Jr.
Title:	President
EQT PRODUCTION COMPANY
By:	/s/ David E. Schlosser, Jr.
Name:	David E. Schlosser, Jr.
Title:	President
EQT CORPORATION
By:	/s/ Robert J. McNally
Name:	Robert J. McNally
Title:	Senior Vice President and Chief Financial Officer

Signature Page to Power of Attorney for EQT Midstream Partners, LP