<TABLE> <S> <C>

<ARTICLE>                    UT

<LEGEND>
This schedule contains summary financial information extracted from the December
31, 1999 Financial  Statements  included in Wisconsin  Power and Light Company's
Form 10-K 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>                                      12-MOS
<FISCAL-YEAR-END>                                              DEC-31-1999
<PERIOD-START>                                                 JAN-01-1999
<PERIOD-END>                                                   DEC-31-1999
<BOOK-VALUE>                                                      PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                        1,241,630
<OTHER-PROPERTY-AND-INVEST>                                        182,082
<TOTAL-CURRENT-ASSETS>                                             121,532
<TOTAL-DEFERRED-CHARGES>                                           138,730
<OTHER-ASSETS>                                                      82,161
<TOTAL-ASSETS>                                                   1,766,135
<COMMON>                                                            66,183
<CAPITAL-SURPLUS-PAID-IN>                                          229,438
<RETAINED-EARNINGS>                                                303,476
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                     599,097
<PREFERRED-MANDATORY>                                                    0
<PREFERRED>                                                         59,963
<LONG-TERM-DEBT-NET>                                               414,673
<SHORT-TERM-NOTES>                                                 125,749
<LONG-TERM-NOTES-PAYABLE>                                           55,100
<COMMERCIAL-PAPER-OBLIGATIONS>                                           0
<LONG-TERM-DEBT-CURRENT-PORT>                                        1,875
<PREFERRED-STOCK-CURRENT>                                                0
<CAPITAL-LEASE-OBLIGATIONS>                                              0
<LEASES-CURRENT>                                                         0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                     509,678
<TOT-CAPITALIZATION-AND-LIAB>                                    1,766,135
<GROSS-OPERATING-REVENUE>                                          752,505
<INCOME-TAX-EXPENSE>                                                45,758 <F1>
<OTHER-OPERATING-EXPENSES>                                         597,600
<TOTAL-OPERATING-EXPENSES>                                         597,600 <F1>
<OPERATING-INCOME-LOSS>                                            154,905
<OTHER-INCOME-NET>                                                   2,675
<INCOME-BEFORE-INTEREST-EXPEN>                                     157,580
<TOTAL-INTEREST-EXPENSE>                                            40,992
<NET-INCOME>                                                        70,830
<PREFERRED-STOCK-DIVIDENDS>                                          3,310
<EARNINGS-AVAILABLE-FOR-COMM>                                       67,520
<COMMON-STOCK-DIVIDENDS>                                            58,353
<TOTAL-INTEREST-ON-BONDS>                                           34,150
<CASH-FLOW-OPERATIONS>                                             162,980
<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>