EXHIBIT 99.1

                                POWER OF ATTORNEY
                                       AND
                              CONFIRMING STATEMENT

     KNOW ALL PERSONS BY THESE PRESENTS, that I hereby designate, appoint, and
constitute, and hereby confirm the designation, appointment and constitution of,
each of Timothy R. Donovan, Anne E. Frueh, Horace V. Draa and James D.
Harrington as my true and lawful attorney-in-fact and agent, with full power of
substitution, for me and in my name, place and stead, in any and all capacities,
to execute and file on my behalf all Forms 3, 4 and 5 (including any amendments
thereto) that I may be required to file with the U.S. Securities and Exchange
Commission and any stock exchange as a result of my direct or indirect ownership
of, or transactions in, securities of Tenneco Inc. or its subsidiary companies.
I hereby further grant unto each said attorney-in-fact and agent all full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, fully to all intents and
purposes as I might or could do in person, hereby ratifying and confirming all
that each said attorney-in-fact and agent or my substitute or substitutes may
lawfully do or cause to be done by virtue of the power and authority granted
hereunder to each attorney-in-fact. The authority of Timothy R. Donovan, Anne E.
Frueh, Horace V. Draa and James D. Harrington under this Power of Attorney and
Confirming Statement shall continue until I am no longer required to file Forms
3, 4 and 5 with regard to my direct or indirect ownership of or transactions in
securities of Tenneco Inc. or its subsidiary companies.

     I hereby acknowledge that Timothy R. Donovan, Anne E. Frueh, Horace V. Draa
and James D. Harrington are not assuming any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act of
1934, as amended.



Date:   May 18, 2006
     -------------------------------------

        /s/ J. Jeffrey Zimmerman
Signed: ----------------------------------