<ARTICLE>                                           UT
<LEGEND>
THIS SCHEDULE  CONTAINS  SUMMARY  INFORMATION  EXTRACTED  FROM THE JUNE 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

                             
<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>                      1,218,822
<OTHER-PROPERTY-AND-INVEST>                    168,050
<TOTAL-CURRENT-ASSETS>                         102,912
<TOTAL-DEFERRED-CHARGES>                       121,508
<OTHER-ASSETS>                                 73,244
<TOTAL-ASSETS>                                 1,684,536
<COMMON>                                       66,183
<CAPITAL-SURPLUS-PAID-IN>                      199,438
<RETAINED-EARNINGS>                            296,718
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 562,339
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                    59,963
<LONG-TERM-DEBT-NET>                           414,626
<SHORT-TERM-NOTES>                             109,035
<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>                 481,598
<TOT-CAPITALIZATION-AND-LIAB>                  1,684,536
<GROSS-OPERATING-REVENUE>                      370,106
<INCOME-TAX-EXPENSE>                           19,497       <F1>
<OTHER-OPERATING-EXPENSES>                     301,805
<TOTAL-OPERATING-EXPENSES>                     301,805      <F1>
<OPERATING-INCOME-LOSS>                        68,301
<OTHER-INCOME-NET>                             4,380
<INCOME-BEFORE-INTEREST-EXPEN>                 72,681
<TOTAL-INTEREST-EXPENSE>                       19,943
<NET-INCOME>                                   33,241
<PREFERRED-STOCK-DIVIDENDS>                    1,656
<EARNINGS-AVAILABLE-FOR-COMM>                  31,585
<COMMON-STOCK-DIVIDENDS>                       29,176
<TOTAL-INTEREST-ON-BONDS>                      33,304
<CASH-FLOW-OPERATIONS>                         72,194
<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>