WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  


<ARTICLE>  UT
<LEGEND>
                                                                      Exhibit 27
                               AMEREN CORPORATION
                               10-Q MARCH 31, 2000
                           FINANCIAL DATA SCHEDULE UT
          PUBLIC UTILITY COMPANIES AND PUBLIC UTILITY HOLDING COMPANIES
                  APPENDIX E TO ITEM 601 (C) OF REGULATION S-K
                 (Thousands of Dollars Except Per Share Amounts)

</LEGEND>


                                                              Value
                                                         ----------------

                                                        
<PERIOD-TYPE>                                                      3-MOS
<FISCAL-YEAR-END>                                            DEC-31-2000
<PERIOD-END>                                                 MAR-31-2000
<BOOK-VALUE>                                                    PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                      7,294,892
<OTHER-PROPERTY-AND-INVEST>                                      288,003
<TOTAL-CURRENT-ASSETS>                                           864,539
<TOTAL-DEFERRED-CHARGES>                                          81,997
<OTHER-ASSETS>                                                   785,858
<TOTAL-ASSETS>                                                 9,315,289
<COMMON>                                                           1,372
<CAPITAL-SURPLUS-PAID-IN>                                      1,582,501
<RETAINED-EARNINGS>                                            1,480,056
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                 3,063,929
<PREFERRED-MANDATORY>                                                  0
<PREFERRED>                                                      235,197
<LONG-TERM-DEBT-NET>                                           2,239,341
<SHORT-TERM-NOTES>                                               232,141
<LONG-TERM-NOTES-PAYABLE>                                              0
<COMMERCIAL-PAPER-OBLIGATIONS>                                         0
<LONG-TERM-DEBT-CURRENT-PORT>                                    287,944
<PREFERRED-STOCK-CURRENT>                                              0
<CAPITAL-LEASE-OBLIGATIONS>                                      103,480
<LEASES-CURRENT>                                                  12,791
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                 3,140,466
<TOT-CAPITALIZATION-AND-LIAB>                                  9,315,289
<GROSS-OPERATING-REVENUE>                                        825,376
<INCOME-TAX-EXPENSE>                                              44,251
<OTHER-OPERATING-EXPENSES>                                       672,547
<TOTAL-OPERATING-EXPENSES>                                       716,798
<OPERATING-INCOME-LOSS>                                          108,578
<OTHER-INCOME-NET>                                                (3,693)
<INCOME-BEFORE-INTEREST-EXPEN>                                   104,885
<TOTAL-INTEREST-EXPENSE>                                          40,294
<NET-INCOME>                                                      61,393
<PREFERRED-STOCK-DIVIDENDS>                                        3,198
<EARNINGS-AVAILABLE-FOR-COMM>                                     61,393
<COMMON-STOCK-DIVIDENDS>                                          87,132
<TOTAL-INTEREST-ON-BONDS>                                              0  <F1>
<CASH-FLOW-OPERATIONS>                                           208,014
<EPS-BASIC>                                                         0.45
<EPS-DILUTED>                                                       0.45

<FN>
<F1>  Required in fiscal year-end only.
</FN>