<ARTICLE>                                           UT
<LEGEND>
THIS SCHEDULE CONTAINS  FINANCIAL  INFORMATION  EXTRACTED FROM THE JUNE 30, 1999
FINANCIAL  STATEMENTS  INCLUDED  IN  ALLIANT  CORPORATION'S  FORM  10-Q  AND  IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK>                         0000352541
<NAME>                        ALLIANT ENERGY CORPORATION
<MULTIPLIER>                                   1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1999
<PERIOD-START>                                 JAN-01-1999
<PERIOD-END>                                   JUN-30-1999
<BOOK-VALUE>                                   PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      3,076,714
<OTHER-PROPERTY-AND-INVEST>                    1,323,853
<TOTAL-CURRENT-ASSETS>                         338,166
<TOTAL-DEFERRED-CHARGES>                       166,317
<OTHER-ASSETS>                                 272,086
<TOTAL-ASSETS>                                 5,177,136
<COMMON>                                       784
<CAPITAL-SURPLUS-PAID-IN>                      926,242
<RETAINED-EARNINGS>                            840,382      <F1>
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 1,767,408
<PREFERRED-MANDATORY>                          24,466
<PREFERRED>                                    89,102
<LONG-TERM-DEBT-NET>                           1,514,498
<SHORT-TERM-NOTES>                             50,024
<LONG-TERM-NOTES-PAYABLE>                      56,975
<COMMERCIAL-PAPER-OBLIGATIONS>                 125,500
<LONG-TERM-DEBT-CURRENT-PORT>                  53,740
<PREFERRED-STOCK-CURRENT>                      0
<CAPITAL-LEASE-OBLIGATIONS>                    25,611
<LEASES-CURRENT>                               12,277
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 1,457,535
<TOT-CAPITALIZATION-AND-LIAB>                  5,177,136
<GROSS-OPERATING-REVENUE>                      1,032,969
<INCOME-TAX-EXPENSE>                           49,039       <F2>
<OTHER-OPERATING-EXPENSES>                     897,724
<TOTAL-OPERATING-EXPENSES>                     897,724      <F2>
<OPERATING-INCOME-LOSS>                        153,245
<OTHER-INCOME-NET>                             47,550
<INCOME-BEFORE-INTEREST-EXPEN>                 200,795
<TOTAL-INTEREST-EXPENSE>                       68,114
<NET-INCOME>                                   83,642
<PREFERRED-STOCK-DIVIDENDS>                    3,353
<EARNINGS-AVAILABLE-FOR-COMM>                  80,289
<COMMON-STOCK-DIVIDENDS>                       77,892
<TOTAL-INTEREST-ON-BONDS>                      90,708
<CASH-FLOW-OPERATIONS>                         203,774
<EPS-BASIC>                                  1.03
<EPS-DILUTED>                                  1.03

<FN>
<F1> Includes $300,613 of Accumulated Other Comprehensive Income

<F2> Income tax expense is not included in Operating Expense in the Consolidated
     Statements of Income.
</FN>