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

  


<ARTICLE>  UT
<LEGEND>

                                                                      Exhibit 27

                               AMEREN CORPORATION
                               10-Q JUNE 30, 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>                                                       6-MOS
<FISCAL-YEAR-END>                                             DEC-31-2000
<PERIOD-END>                                                  JUN-30-2000
<BOOK-VALUE>                                                     PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                       7,426,793
<OTHER-PROPERTY-AND-INVEST>                                       259,449
<TOTAL-CURRENT-ASSETS>                                            779,565
<TOTAL-DEFERRED-CHARGES>                                           83,351
<OTHER-ASSETS>                                                    763,305
<TOTAL-ASSETS>                                                  9,312,463
<COMMON>                                                            1,372
<CAPITAL-SURPLUS-PAID-IN>                                       1,582,501
<RETAINED-EARNINGS>                                             1,506,290
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                  3,090,163
<PREFERRED-MANDATORY>                                                   0
<PREFERRED>                                                       235,197
<LONG-TERM-DEBT-NET>                                            2,394,325
<SHORT-TERM-NOTES>                                                336,053
<LONG-TERM-NOTES-PAYABLE>                                               0
<COMMERCIAL-PAPER-OBLIGATIONS>                                          0
<LONG-TERM-DEBT-CURRENT-PORT>                                      44,444
<PREFERRED-STOCK-CURRENT>                                               0
<CAPITAL-LEASE-OBLIGATIONS>                                       105,675
<LEASES-CURRENT>                                                   12,782
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                  3,093,824
<TOT-CAPITALIZATION-AND-LIAB>                                   9,312,463
<GROSS-OPERATING-REVENUE>                                       1,765,680
<INCOME-TAX-EXPENSE>                                              123,490
<OTHER-OPERATING-EXPENSES>                                      1,374,406
<TOTAL-OPERATING-EXPENSES>                                      1,497,896
<OPERATING-INCOME-LOSS>                                           267,784
<OTHER-INCOME-NET>                                                 (5,171)
<INCOME-BEFORE-INTEREST-EXPEN>                                    262,613
<TOTAL-INTEREST-EXPENSE>                                           81,396
<NET-INCOME>                                                      174,978
<PREFERRED-STOCK-DIVIDENDS>                                         6,239
<EARNINGS-AVAILABLE-FOR-COMM>                                     174,978
<COMMON-STOCK-DIVIDENDS>                                          174,264
<TOTAL-INTEREST-ON-BONDS>                                               0 <F1>
<CASH-FLOW-OPERATIONS>                                            254,251
<EPS-BASIC>                                                          1.28
<EPS-DILUTED>                                                        1.28

<FN>
<FN 1>  Required in fiscal year-end only.
</FN>