[PriceWaterhouseCoopers Letterhead]



                                                                      EXHIBIT 23




                       CONSENT OF INDEPENDENT ACCOUNTANTS


     We hereby  consent to the  incorporation  by reference in the  Registration
Statement  on Form S-8 (No.  333-43737)  and Form S-3 (No.  33-43721)  of Ameren
Corporation of our report dated June 28, 2000 on the financial statements of the
Ameren Corporation Savings Investment Plan for the year ended December 31, 1999,
which is included in this Form 11-K.




/s/ PricewaterhouseCoopers LLP

St. Louis, Missouri
June 28, 2000