<TABLE> <S> <C>
<ARTICLE> UT
<LEGEND>
This schedule contains summary financial information extracted from the
September 30, 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> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<BOOK-VALUE> PER-BOOK
<TOTAL-NET-UTILITY-PLANT> 3,116,372
<OTHER-PROPERTY-AND-INVEST> 2,281,298
<TOTAL-CURRENT-ASSETS> 485,774
<TOTAL-DEFERRED-CHARGES> 208,202
<OTHER-ASSETS> 255,795
<TOTAL-ASSETS> 6,347,441
<COMMON> 790
<CAPITAL-SURPLUS-PAID-IN> 946,687
<RETAINED-EARNINGS> 1,130,685 <F1>
<TOTAL-COMMON-STOCKHOLDERS-EQ> 2,078,162
24,650
89,102
<LONG-TERM-DEBT-NET> 1,591,859
<SHORT-TERM-NOTES> 35,034
<LONG-TERM-NOTES-PAYABLE> 55,100
<COMMERCIAL-PAPER-OBLIGATIONS> 412,755
<LONG-TERM-DEBT-CURRENT-PORT> 92,704
0
<CAPITAL-LEASE-OBLIGATIONS> 17,365
<LEASES-CURRENT> 12,075
<OTHER-ITEMS-CAPITAL-AND-LIAB> 1,938,635
<TOT-CAPITALIZATION-AND-LIAB> 6,347,441
<GROSS-OPERATING-REVENUE> 1,851,837
<INCOME-TAX-EXPENSE> 213,879 <F2>
<OTHER-OPERATING-EXPENSES> 1,563,259
<TOTAL-OPERATING-EXPENSES> 1,563,259 <F2>
<OPERATING-INCOME-LOSS> 288,578
<OTHER-INCOME-NET> 395,634 <F3> <F4>
<INCOME-BEFORE-INTEREST-EXPEN> 684,212 <F3>
<TOTAL-INTEREST-EXPENSE> 127,452
<NET-INCOME> 342,881 <F3>
5,035
<EARNINGS-AVAILABLE-FOR-COMM> 337,846
<COMMON-STOCK-DIVIDENDS> 118,475
<TOTAL-INTEREST-ON-BONDS> 145,490
<CASH-FLOW-OPERATIONS> 360,237
<EPS-BASIC> 4.28
<EPS-DILUTED> 4.27
<FN>
<F1> Includes $333,850 of Accumulated Other Comprehensive Income.
<F2> Income tax expense is not included in Operating Expense in the Consolidated Statements of Income.
<F3>Includes $16,708 of Cumulative Effect of a Change in Accounting Principle, Net of Tax.
<F4> Includes $321,349 of Gain on Reclassification of Investments.
</FN>
</TABLE>
