EXHIBIT 24


                               POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of John M. Donnan,
Leigh Ann Clifford, Troy B. Lewis, Anna Marie Dempsey, Stephanie R. Fisch
and Angela Y. Mo, or any of them, signing singly, the undersigned's true
and lawful attorney-in-fact to:

1. to the extent the undersigned does not have the access codes necessary
to file on EDGAR, execute for and on behalf of the undersigned a Form ID
and any other form required to be filed or submitted in accordance with
Regulation S-T promulgated by the United States Securities and Exchange
Commission (the "Commission") in order to obtain such codes; and

2. execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of Kaiser Aluminum Corporation (the
"Company"), Forms 3, 4 and 5 in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules thereunder;

3. do and perform any and all acts for and on behalf of the undersigned
that may be necessary or desirable to complete and execute any such Form
ID or Form 3, 4 or 5 and timely file any such form or forms with the
Commission and any stock exchange or similar authority; and

4. take any other action of any type whatsoever in connection with the
foregoing that, 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 sole discretion.

The undersigned hereby grants to each such attorney-in-fact and any of them
full power and authority to do and perform any and every act and thing
whatsoever, necessary or desirable 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 any
such attorney-in-fact, or any 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
acknowledges that none of the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are 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 execution by the undersigned of this power of attorney hereby expressly
revokes and terminates any powers of attorney previously granted by the
undersigned with respect to a Form ID or Forms 3, 4 and 5 involving Company
securities. This power of attorney shall remain in full force and effect
until the undersigned is no longer required to file a Form ID or Forms 3, 4
and 5 with respect to the undersigned's holdings of 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.

IN WITNESS WHEREOF, the undersigned has caused this power of attorney to be
executed as of the 6th day of February, 2006.

/s/ Thomas M. Van Leeuwen
Thomas M. Van Leeuwen