(99)


                    CERTIFICATION OF CEO AND CFO PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the Annual Report on Form 11-K of the Consumers Energy
Company Employees' Savings Plan and Employee Stock Ownership Plan (the "Plan")
for the annual period ended December 31, 2002 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), Kenneth Whipple, as
Chairman of the Board and Chief Executive Officer of CMS Energy Corporation and
Consumers Energy Company (together referred to as the "Companies"), and Thomas
J. Webb, as Executive Vice President and Chief Financial Officer of the
Companies, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of
his knowledge:

         (1) The Report fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

         (2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Plan.


   /s/ Kenneth Whipple
- -----------------------------------
Name:  Kenneth Whipple
Title: Chairman of the Board and
       Chief Executive Officer
Date:  June 30, 2003


  /s/  Thomas J. Webb
- -----------------------------------
Name:  Thomas J. Webb
Title: Executive Vice President and
       Chief Financial Officer
Date:  June 30, 2003



This certification accompanies the Report pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the
Sarbanes-Oxley Act of 2002, be deemed filed by the Companies for purposes of
Section 18 of the Securities and Exchange Act of 1934, as amended.