ALCOA CORPORATION
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that I, the undersigned director and/or officer of Alcoa
Corporation, a Delaware corporation (the Company), hereby constitute and appoint Jeffrey D. Heeter,
Marissa P. Earnest, Eryn F. Correa, Mary A. Vogel and any Assistant Secretary of the Company, and
each of them, my true and lawful attorneys-in-fact and agents, with full power to act, together or each
without the other, with full power of substitution and resubstitution, 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 acquisition or disposition of securities of the Company that the undersigned may be required to
file with the U.S. Securities and Exchange Commission (the SEC) in accordance with Section 16(a) of the
Securities Exchange Act of 1934, as amended (the Exchange Act), and the rules promulgated
thereunder, (ii) any voluntary filings under Section 16(a) of the Exchange Act, (iii) to request electronic
filing codes from the SEC by filing the Form ID (including amendments thereto) and any other documents
necessary or appropriate to obtain codes and passwords enabling the undersigned to file such reports
electronically, (iv) any documents or reports that may be required under SEC Rule 144 to permit the
undersigned to sell Company common stock without registration under the Securities Act of 1933, as
amended (the Securities Act) in reliance on Rule 144 as amended from time to time, or (v) take any other
action of any type whatsoever in connection with the foregoing which, in the opinion of such attorneys-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 attorneys-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
attorneys-in-fact may approve in such attorney-in-fact's or attorneys-in-fact's discretion.
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(a) of the Exchange Act or the Securities Act. The Company will
use all reasonable efforts to apprise the undersigned of applicable filing requirements for purposes of
Section 16(a) of the Exchange Act or the Securities Act.
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, acquisition or disposition of securities of the Company.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of
this
9th day of May , 2018.
Signature: /s/ Suzanne Sitherwood
Printed Name: Suzanne Sitherwood
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