Power of Attorney – Alcoa

(1)

To enable the Company to comply with the Securities Exchange Act of 1934, as
amended (the “1934 Act”), and any rules, regulations or requirements of the
Securities and Exchange Commission (the “Commission”) in respect thereof, in
connection with the filing under the 1934 Act of the Company’s Annual Report on
Form 10-K for the year ended December 31, 2009 (the “2009 Annual Report”),
including specifically, but without limiting the generality of the foregoing,
power and authority to sign the name of each of the undersigned in the capacity
of Director of the Company to the 2009 Annual Report to be filed with the
Commission and to any instruments or documents filed as part of or in connection
with the 2009 Annual Report, including any amendments or supplements thereto;

(2)

To enable the Company to comply with the Securities Act of 1933, as amended
(the “1933 Act”), and any rules, regulations or requirements of the Commission
in respect thereof, in connection with the registration under the 1933 Act
during 2010 of the offer and sale or delivery of shares of common stock of the
Company to be issued under the 2009 Alcoa Stock Incentive Plan (the “2009
Plan”), the 2004 Alcoa Stock Incentive Plan (the “2004 Plan”) or the Alcoa Stock
Incentive Plan (the “Stock Incentive Plan”), including specifically, but without
limiting the generality of the foregoing, power and authority to sign the name
of each of the undersigned in the capacity of Director of the Company to any
registration statement on Form S-8, or on such other form as may be appropriate,
to be filed with the Commission in respect of said shares and the 2009 Plan, the
2004 Plan or the Stock Incentive Plan, or any of them, to any and all
pre-effective amendments, post-effective amendments and supplements to any such
registration statement, and to any instruments or documents filed as part of or
in connection with any such registration statement or any such amendments or
supplements thereto; and

(3)

To enable the Company to comply with the 1933 Act, and any rules, regulations
or requirements of the Commission in respect thereof, in connection with the
registration under the 1933 Act during 2010 of the offer and sale or delivery of
shares of common stock of the Company to be issued under the Company’s employee
savings plans (together with interests in such plans), including, without
limitation, the Alcoa Savings Plan for Bargaining Employees, the Alcoa Savings
Plan for Non-Bargaining Employees, the Alcoa Savings Plan for Subsidiary and
Affiliate Employees, the Alcoa UK Holdings Limited 2002 Inland Revenue Approved
Share Incentive Plan and employee savings plans sponsored by entities acquired
by the Company from time to time (the “Plans”), including specifically, but
without limiting the generality of the foregoing, power and authority to sign
the name of each of the undersigned in the capacity of Director of the Company
to any registration statement on Form S-8, or on such other form as may be
appropriate, to be filed with the Commission in respect of said shares and the
Plans (or interests in such Plans), or any of them, to any and all pre-effective
amendments, post-effective amendments and supplements to any such registration
statement, and to any instruments or documents filed as part of or in connection
with any such registration statement or any such amendments or supplements
thereto; and

By:

/s/ Alain J.P. Belda

By:

/s/ James W. Owens

Alain J.P. Belda

James W. Owens

By:

/s/ Kathryn S. Fuller

By:

/s/ Patricia F. Russo

Kathryn S. Fuller

Patricia F. Russo

By:

/s/ Carlos Ghosn

By:

/s/ Henry B. Schacht

Carlos Ghosn

Henry B. Schacht

By:

/s/ Joseph T. Gorman

By:

/s/ Ratan N. Tata

Joseph T. Gorman

Ratan N. Tata

By:

/s/ Judith M. Gueron

By:

/s/ Franklin A. Thomas

Judith M. Gueron

Franklin A. Thomas

By:

/s/ Michael G. Morris

By:

/s/ Ernesto Zedillo

Michael G. Morris

Ernesto Zedillo

By:

/s/ E. Stanley O’Neal

E. Stanley O’Neal