Exhibit 23

                         CONSENT OF INDEPENDENT AUDITORS


We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statements on Form S-8 (Nos.  333-43737 and 333-72156) of Ameren  Corporation of
our report  dated June 20, 2003  relating  to the  financial  statements  of the
Ameren Corporation Savings Investment Plan, which appears in this Form 11-K.


/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
St. Louis, Missouri
June 30, 2003