POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby
constitutes and appoints Robert K. Reeves,
Linda A. Mansker, Mitchell W. McCraw and
David L. Siddall, signing singly, the undersigned's
true and lawful attorney-in-fact to:

1. execute for and on behalf of the undersigned, in the
undersigned's capacity as a director of Anadarko Petroleum
Corporation (the "Company"), Forms ID, 3, 4 and 5,
pursuant to Section 16(a) of the Securities Exchange Act
of 1934 and the rules thereunder, and Form 144, pursuant
to Rule 144 under the Securities Act of 1933 and
the rules thereunder, if required; and

2. 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 Form 3, Form 4, Form 5 or
Form 144 and timely file such form with the United States
Securities and Exchange Commission and any stock exchange
or similar authority; and

3. 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 grants 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
shall lawfully do or cause to be done by virtue of this
power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing
attorney-in-fact, in serving in such capacity at the
request of the undersigned, is not assuming, nor is the
Company assuming, any of the undersigned's
responsibilities to comply with Section 16(a) of the
Securities Exchange Act of 1934 or Rule 144 of the
Securities Act of 1933.

This Power of Attorney shall remain in full force and
effect until the undersigned is no longer a director of
the Company unless earlier revoked by the undersigned in a
signed writing delivered to the foregoing attorneys-in-
fact; provided, however, this Power of Attorney will
expire immediately upon the termination of employment of
any attorney-in-fact as to that attorney-in-fact only, but
not as to any other appointed attorney-in-fact hereunder.

IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 6th day of June,
2007.

/s/Larry Barcus