<ARTICLE> UT
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-30-1997
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    2,936,084
<OTHER-PROPERTY-AND-INVEST>                    939,635
<TOTAL-CURRENT-ASSETS>                       1,040,036  
<TOTAL-DEFERRED-CHARGES>                       121,407
<OTHER-ASSETS>                                 196,762
<TOTAL-ASSETS>                               5,233,924
<COMMON>                                       284,087
<CAPITAL-SURPLUS-PAID-IN>                      501,486
<RETAINED-EARNINGS>                            784,810
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,570,383
<PREFERRED-MANDATORY>                           25,000
<PREFERRED>                                     78,475
<LONG-TERM-DEBT-NET>                         1,699,245
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                      269,210
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                  114,977
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                     88,578
<LEASES-CURRENT>                                 6,723
<OTHER-ITEMS-CAPITAL-AND-LIAB>               1,381,333
<TOT-CAPITALIZATION-AND-LIAB>                5,233,924
<GROSS-OPERATING-REVENUE>                    2,217,007
<INCOME-TAX-EXPENSE>                           160,161
<OTHER-OPERATING-EXPENSES>                   1,712,676
<TOTAL-OPERATING-EXPENSES>                   1,872,837
<OPERATING-INCOME-LOSS>                        344,170
<OTHER-INCOME-NET>                              16,804
<INCOME-BEFORE-INTEREST-EXPEN>                 360,974
<TOTAL-INTEREST-EXPENSE>                       109,367 <F1>
<NET-INCOME>                                   251,607
<PREFERRED-STOCK-DIVIDENDS>                          0 <F1>
<EARNINGS-AVAILABLE-FOR-COMM>                  251,607
<COMMON-STOCK-DIVIDENDS>                       178,423
<TOTAL-INTEREST-ON-BONDS>                       69,545
<CASH-FLOW-OPERATIONS>                         539,141
<EPS-PRIMARY>                                     2.20
<EPS-DILUTED>                                     2.20
<FN>
<F1> PREFERRED DIVIDEND OF SUBSIDIARY INCLUDED IN INTEREST EXPENSE