ALCOA UPSTREAM CORPORATION
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that I, the undersigned director and/or
officer (or nominee) of Alcoa Upstream Corporation, a Delaware corporation (the "Company"),
hereby constitute and appoint Jeffrey D. Heeter, Marissa P. Earnest, and Jackie D. Myers, and
any Assistant Secretary of the Company, and each of them, as my true and lawful attorneys-in-
fact and agents, with full power to act, together or each without the other, for me and in my
name, place and stead, in any and all capacities, to execute and file for and on behalf of the
undersigned (i) any reports on Forms 3, 4 and 5 (including any amendments thereto and any
successors to such Forms) with respect to ownership of securities of the Company, that the
undersigned may be required to file with the U.S. Securities and Exchange Commission in
accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder
and (ii) any other documents necessary or appropriate to obtain codes and passwords enabling
the undersigned to file such reports electronically.
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. The Company will use all reasonable efforts to apprise the undersigned of applicable
filing requirements for Section 16 purposes.
This 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 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. This Power of Attorney revokes and replaces any
prior Power of Attorney executed by the undersigned with respect to the ownership of securities
of the Company.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 24th day of October, 2016.
Signature: /s/ Suzanne Sitherwood
Print Name: Suzanne Sitherwood
