<ARTICLE> UT
<LEGEND>
                                                                     Exhibit 27
                               AMEREN CORPORATION
                             10-Q SEPTEMBER 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>



                                                        
<PERIOD-TYPE>                                                    9-MOS
<FISCAL-YEAR-END>                                          DEC-31-2000
<PERIOD-END>                                               SEP-30-2000
<BOOK-VALUE>                                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                    7,528,343
<OTHER-PROPERTY-AND-INVEST>                                    234,456
<TOTAL-CURRENT-ASSETS>                                       1,005,907
<TOTAL-DEFERRED-CHARGES>                                        89,049
<OTHER-ASSETS>                                                 763,927
<TOTAL-ASSETS>                                               9,621,682
<COMMON>                                                         1,372
<CAPITAL-SURPLUS-PAID-IN>                                    1,581,871
<RETAINED-EARNINGS>                                          1,675,073
<TOTAL-COMMON-STOCKHOLDERS-EQ>                               3,258,316
<PREFERRED-MANDATORY>                                                0
<PREFERRED>                                                    235,197
<LONG-TERM-DEBT-NET>                                         2,202,137
<SHORT-TERM-NOTES>                                             469,743
<LONG-TERM-NOTES-PAYABLE>                                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                                       0
<LONG-TERM-DEBT-CURRENT-PORT>                                   47,044
<PREFERRED-STOCK-CURRENT>                                            0
<CAPITAL-LEASE-OBLIGATIONS>                                    103,075
<LEASES-CURRENT>                                                12,653
<OTHER-ITEMS-CAPITAL-AND-LIAB>                               3,293,517
<TOT-CAPITALIZATION-AND-LIAB>                                9,621,682
<GROSS-OPERATING-REVENUE>                                    2,961,091
<INCOME-TAX-EXPENSE>                                           287,196
<OTHER-OPERATING-EXPENSES>                                   2,100,426
<TOTAL-OPERATING-EXPENSES>                                   2,387,622
<OPERATING-INCOME-LOSS>                                        573,469
<OTHER-INCOME-NET>                                              (9,402)
<INCOME-BEFORE-INTEREST-EXPEN>                                 564,067
<TOTAL-INTEREST-EXPENSE>                                       123,483
<NET-INCOME>                                                   431,115
<PREFERRED-STOCK-DIVIDENDS>                                      9,469
<EARNINGS-AVAILABLE-FOR-COMM>                                  431,115
<COMMON-STOCK-DIVIDENDS>                                       261,395
<TOTAL-INTEREST-ON-BONDS>                                            0  <F1>
<CASH-FLOW-OPERATIONS>                                         761,920
<EPS-BASIC>                                                       3.14
<EPS-DILUTED>                                                     3.14

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