Exhibit (23)(f)

            Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration
Statements and in the related Prospectuses of CMS Energy Corporation:

     (1)  Registration Statements (Form S-3 No. 333-125553, No. 333-52560, No.
          333-27849, No. 333-37241, No. 333-74958, No. 333-45556) of CMS Energy
          Corporation;

     (2)  Registration Statements (Form S-4 No. 33-60007 and No. 33-55805) of
          CMS Energy Corporation;

     (3)  Registration Statements (Form S-8 No. 333-32229 and No. 333-58686)
          pertaining to the CMS Energy Corporation Performance Incentive Stock
          Plan and Executive Stock Option Plan, respectively, and

     (4)  Registration Statement (Form S-8 No. 333-76347) pertaining to the
          Employee Savings and Incentive Plan of Consumers Energy Company;

of our report dated 29 October 2004 with respect to the consolidated financial
statements of SCP Investments (No.1) Pty Ltd, for the year ended June 30, 2004
included in the CMS Energy Corporation Annual Report (Form 10-K/A) for the year
ended December 31, 2005.


                                        /s/ Ernst & Young

Perth, Australia
05 June 2006