<ARTICLE> UT <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE MARCH 31, 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> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-1999 <PERIOD-END> MAR-31-1999 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 1,221,777 <OTHER-PROPERTY-AND-INVEST> 165,733 <TOTAL-CURRENT-ASSETS> 92,550 <TOTAL-DEFERRED-CHARGES> 113,058 <OTHER-ASSETS> 74,788 <TOTAL-ASSETS> 1,667,906 <COMMON> 66,183 <CAPITAL-SURPLUS-PAID-IN> 199,438 <RETAINED-EARNINGS> 305,181 <TOTAL-COMMON-STOCKHOLDERS-EQ> 570,802 <PREFERRED-MANDATORY> 0 <PREFERRED> 59,963 <LONG-TERM-DEBT-NET> 414,603 <SHORT-TERM-NOTES> 51,102 <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> 514,461 <TOT-CAPITALIZATION-AND-LIAB> 1,667,906 <GROSS-OPERATING-REVENUE> 202,990 <INCOME-TAX-EXPENSE> 15,505 <F1> <OTHER-OPERATING-EXPENSES> 156,599 <TOTAL-OPERATING-EXPENSES> 156,599 <F1> <OPERATING-INCOME-LOSS> 46,391 <OTHER-INCOME-NET> 5,267 <INCOME-BEFORE-INTEREST-EXPEN> 51,658 <TOTAL-INTEREST-EXPENSE> 9,865 <NET-INCOME> 26,288 <PREFERRED-STOCK-DIVIDENDS> 828 <EARNINGS-AVAILABLE-FOR-COMM> 25,460 <COMMON-STOCK-DIVIDENDS> 14,588 <TOTAL-INTEREST-ON-BONDS> 33,060 <CASH-FLOW-OPERATIONS> 83,618 <EPS-PRIMARY> 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 Interstate Energy Corporation. </FN>