<TABLE> <S> <C>

<ARTICLE>                     UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE JUNE 30,
1997 FINANCIAL  STATEMENTS OF INTERSTATE ENERGY  CORPORATION AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. CERTAIN ADJUSTMENTS HAVE
BEEN MADE TO THE PRIOR PERIOD AMOUNTS AS PART OF THE  RESTATEMENT TO REFLECT THE
POOLING OF INTERESTS TRANSACTION,  AND A CHANGE IN ACCOUNTING METHOD FOR OIL AND
GAS PROPERTIES FROM THE FULL COST METHOD TO THE SUCCESSFUL EFFORTS METHOD.
</LEGEND>
<RESTATED>
<CIK>      0000352541
<NAME>     INTERSTATE ENERGY CORPORATION
<MULTIPLIER>     1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                                          DEC-31-1997
<PERIOD-START>                                             JAN-01-1997
<PERIOD-END>                                               JUN-30-1997
<BOOK-VALUE>                                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                    3,086,472
<OTHER-PROPERTY-AND-INVEST>                                    627,880
<TOTAL-CURRENT-ASSETS>                                         420,725
<TOTAL-DEFERRED-CHARGES>                                       159,384
<OTHER-ASSETS>                                                 378,050
<TOTAL-ASSETS>                                               4,672,511
<COMMON>                                                           762
<CAPITAL-SURPLUS-PAID-IN>                                      861,265
<RETAINED-EARNINGS>                                            569,458
<TOTAL-COMMON-STOCKHOLDERS-EQ>                               1,431,485
<PREFERRED-MANDATORY>                                           24,205
<PREFERRED>                                                     89,102
<LONG-TERM-DEBT-NET>                                         1,358,897
<SHORT-TERM-NOTES>                                              55,005
<LONG-TERM-NOTES-PAYABLE>                                       56,975
<COMMERCIAL-PAPER-OBLIGATIONS>                                 207,200
<LONG-TERM-DEBT-CURRENT-PORT>                                   74,470
<PREFERRED-STOCK-CURRENT>                                            0
<CAPITAL-LEASE-OBLIGATIONS>                                     13,816
<LEASES-CURRENT>                                                13,937
<OTHER-ITEMS-CAPITAL-AND-LIAB>                               1,347,419
<TOT-CAPITALIZATION-AND-LIAB>                                4,672,511
<GROSS-OPERATING-REVENUE>                                    1,157,491
<INCOME-TAX-EXPENSE>                                            36,116 <F1>
<OTHER-OPERATING-EXPENSES>                                   1,008,185
<TOTAL-OPERATING-EXPENSES>                                   1,008,185 <F1>
<OPERATING-INCOME-LOSS>                                        149,306
<OTHER-INCOME-NET>                                               7,577
<INCOME-BEFORE-INTEREST-EXPEN>                                 156,883
<TOTAL-INTEREST-EXPENSE>                                        56,934
<NET-INCOME>                                                    63,833
<PREFERRED-STOCK-DIVIDENDS>                                      3,346
<EARNINGS-AVAILABLE-FOR-COMM>                                   60,487
<COMMON-STOCK-DIVIDENDS>                                        72,492
<TOTAL-INTEREST-ON-BONDS>                                       88,295
<CASH-FLOW-OPERATIONS>                                         200,443
<EPS-PRIMARY>                                                     0.80
<EPS-DILUTED>                                                     0.80
<FN>
<F1> Income tax expense is not included in Operating Expense in the Consolidated
Statements of Income.
</FN>
                                               


</TABLE>