<TABLE> <S> <C>

<ARTICLE>                                      UT
<LEGEND>
This schedule  contains summary  financial  information  extracted from the
September 30, 1999 Financial  Statements  included in Wisconsin  Power and Light
Company's  Form 10-Q and is  qualified  in its  entirety  by  reference  to such
Financial Statements.
</LEGEND>

<CIK>     0000107832
<NAME>    WISCONSIN POWER AND LIGHT COMPANY
<MULTIPLIER>     1,000


     <S>                                         <C>
<PERIOD-TYPE>                                   9-MOS
<FISCAL-YEAR-END>                                          DEC-31-1999
<PERIOD-START>                                             JAN-01-1999
<PERIOD-END>                                               SEP-30-1999
<BOOK-VALUE>                                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                    1,224,903
<OTHER-PROPERTY-AND-INVEST>                                    168,632
<TOTAL-CURRENT-ASSETS>                                          97,794
<TOTAL-DEFERRED-CHARGES>                                       121,442
<OTHER-ASSETS>                                                  75,267
<TOTAL-ASSETS>                                               1,688,038
<COMMON>                                                        66,183
<CAPITAL-SURPLUS-PAID-IN>                                      229,438
<RETAINED-EARNINGS>                                            295,491
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                 591,112
<PREFERRED-MANDATORY>                                                0
<PREFERRED>                                                     59,963
<LONG-TERM-DEBT-NET>                                           414,650
<SHORT-TERM-NOTES>                                              77,145
<LONG-TERM-NOTES-PAYABLE>                                       56,975
<COMMERCIAL-PAPER-OBLIGATIONS>                                       0
<LONG-TERM-DEBT-CURRENT-PORT>                                        0
<PREFERRED-STOCK-CURRENT>                                            0
<CAPITAL-LEASE-OBLIGATIONS>                                          0
<LEASES-CURRENT>                                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                 488,193
<TOT-CAPITALIZATION-AND-LIAB>                                1,688,038
<GROSS-OPERATING-REVENUE>                                      556,896
<INCOME-TAX-EXPENSE>                                            28,579 <F1>
<OTHER-OPERATING-EXPENSES>                                     456,142
<TOTAL-OPERATING-EXPENSES>                                     456,142 <F1>
<OPERATING-INCOME-LOSS>                                        100,754
<OTHER-INCOME-NET>                                               5,550
<INCOME-BEFORE-INTEREST-EXPEN>                                 106,304
<TOTAL-INTEREST-EXPENSE>                                        30,295
<NET-INCOME>                                                    47,430
<PREFERRED-STOCK-DIVIDENDS>                                      2,483
<EARNINGS-AVAILABLE-FOR-COMM>                                   44,947
<COMMON-STOCK-DIVIDENDS>                                        43,765
<TOTAL-INTEREST-ON-BONDS>                                       33,513
<CASH-FLOW-OPERATIONS>                                         131,995
<EPS-BASIC>                                                        0 <F2>
<EPS-DILUTED>                                                        0 <F2>

<FN>
<F1> Income  tax  expense  is not  included  in  Operating  Expense  in the
     Consolidated Statements of Income.

<F2>Earnings  per share of common stock is not reflected  because all common
    shares are held by Alliant Energy Corporation.
</FN>


</TABLE>