<TABLE> <S> <C>

<ARTICLE>                     UT

<LEGEND>
This schedule  contains summary financial  information  extracted from the March
31, 2000 Financial Statements included in Alliant Energy 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


<S>                                                   <C>
<PERIOD-TYPE>                                 3-MOS
<FISCAL-YEAR-END>                                       DEC-31-2000
<PERIOD-START>                                          JAN-01-2000
<PERIOD-END>                                            MAR-31-2000
<BOOK-VALUE>                                               PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                 3,116,478
<OTHER-PROPERTY-AND-INVEST>                               2,935,536
<TOTAL-CURRENT-ASSETS>                                      368,282
<TOTAL-DEFERRED-CHARGES>                                    196,094
<OTHER-ASSETS>                                              261,427
<TOTAL-ASSETS>                                            6,877,817
<COMMON>                                                        790
<CAPITAL-SURPLUS-PAID-IN>                                   945,308
<RETAINED-EARNINGS>                                       1,471,236 <F1>
<TOTAL-COMMON-STOCKHOLDERS-EQ>                            2,417,334
<PREFERRED-MANDATORY>                                        24,575
<PREFERRED>                                                  89,102
<LONG-TERM-DEBT-NET>                                      2,019,502
<SHORT-TERM-NOTES>                                               54
<LONG-TERM-NOTES-PAYABLE>                                    55,100
<COMMERCIAL-PAPER-OBLIGATIONS>                              300,785
<LONG-TERM-DEBT-CURRENT-PORT>                                 5,692
<PREFERRED-STOCK-CURRENT>                                         0
<CAPITAL-LEASE-OBLIGATIONS>                                  22,940
<LEASES-CURRENT>                                             13,285
<OTHER-ITEMS-CAPITAL-AND-LIAB>                            1,929,448
<TOT-CAPITALIZATION-AND-LIAB>                             6,877,817
<GROSS-OPERATING-REVENUE>                                   620,850
<INCOME-TAX-EXPENSE>                                         12,438 <F2>
<OTHER-OPERATING-EXPENSES>                                  532,460
<TOTAL-OPERATING-EXPENSES>                                  532,460 <F2>
<OPERATING-INCOME-LOSS>                                      88,390
<OTHER-INCOME-NET>                                           25,157
<INCOME-BEFORE-INTEREST-EXPEN>                              113,547
<TOTAL-INTEREST-EXPENSE>                                     80,111 <F3>
<NET-INCOME>                                                 20,998
<PREFERRED-STOCK-DIVIDENDS>                                   1,678
<EARNINGS-AVAILABLE-FOR-COMM>                                19,320
<COMMON-STOCK-DIVIDENDS>                                     39,498
<TOTAL-INTEREST-ON-BONDS>                                   144,211
<CASH-FLOW-OPERATIONS>                                      185,719
<EPS-BASIC>                                                    0.24
<EPS-DILUTED>                                                  0.24


<FN>
<F1> Includes $913,950 of Accumulated Other Comprehensive Income.

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

<F3> Includes $39,493 of Contingent Interest on Indexed Debt Securities.
</FN>

</TABLE>