<ARTICLE>                                           UT
<LEGEND>
This schedule contains summary financial  information extracted from the balance
sheet,  income statement and cash flow statement of Illinova  Corporation and is
qualified in its entirety by reference to the balance  sheet,  income  statement
and cash flow statement of Illinova Corporation.
</LEGEND>
<CIK>                         0000914755
<NAME>                        Illinova Corporation
<SUBSIDIARY>
   <NUMBER>                   0
   <NAME>                     0
<MULTIPLIER>                                   1,000,000
<CURRENCY>                                     Default

                             
<PERIOD-TYPE>                   3-mos
<FISCAL-YEAR-END>                              Dec-31-1999
<PERIOD-START>                                 Jan-01-1999
<PERIOD-END>                                   Mar-31-1999
<EXCHANGE-RATE>                                1
<BOOK-VALUE>                                   Per-book
<TOTAL-NET-UTILITY-PLANT>                      4470
<OTHER-PROPERTY-AND-INVEST>                    257
<TOTAL-CURRENT-ASSETS>                         539
<TOTAL-DEFERRED-CHARGES>                       804
<OTHER-ASSETS>                                 0
<TOTAL-ASSETS>                                 6070
<COMMON>                                       972
<CAPITAL-SURPLUS-PAID-IN>                      0
<RETAINED-EARNINGS>                            (3)
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 969
<PREFERRED-MANDATORY>                          195
<PREFERRED>                                    53
<LONG-TERM-DEBT-NET>                           2028
<SHORT-TERM-NOTES>                             91
<LONG-TERM-NOTES-PAYABLE>                      176
<COMMERCIAL-PAPER-OBLIGATIONS>                 173
<LONG-TERM-DEBT-CURRENT-PORT>                  162
<PREFERRED-STOCK-CURRENT>                      0
<CAPITAL-LEASE-OBLIGATIONS>                    51
<LEASES-CURRENT>                               20
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 2152
<TOT-CAPITALIZATION-AND-LIAB>                  6070
<GROSS-OPERATING-REVENUE>                      548
<INCOME-TAX-EXPENSE>                           11
<OTHER-OPERATING-EXPENSES>                     485
<TOTAL-OPERATING-EXPENSES>                     496
<OPERATING-INCOME-LOSS>                        52
<OTHER-INCOME-NET>                             11
<INCOME-BEFORE-INTEREST-EXPEN>                 63
<TOTAL-INTEREST-EXPENSE>                       46
<NET-INCOME>                                   17
<PREFERRED-STOCK-DIVIDENDS>                    1
<EARNINGS-AVAILABLE-FOR-COMM>                  18
<COMMON-STOCK-DIVIDENDS>                       22
<TOTAL-INTEREST-ON-BONDS>                      30
<CASH-FLOW-OPERATIONS>                        (58)
<EPS-BASIC>                                  0.25
<EPS-DILUTED>                                  0.25