<ARTICLE> UT
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               DEC-31-1998
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    6,928,039
<OTHER-PROPERTY-AND-INVEST>                    248,571
<TOTAL-CURRENT-ASSETS>                         771,160
<TOTAL-DEFERRED-CHARGES>                        78,091
<OTHER-ASSETS>                                 821,578
<TOTAL-ASSETS>                               8,847,439
<COMMON>                                         1,372
<CAPITAL-SURPLUS-PAID-IN>                    1,582,548
<RETAINED-EARNINGS>                          1,472,200
<TOTAL-COMMON-STOCKHOLDERS-EQ>               3,056,120
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                    235,197
<LONG-TERM-DEBT-NET>                         2,239,794
<SHORT-TERM-NOTES>                              58,528
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                  184,444
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                     49,630
<LEASES-CURRENT>                                17,269
<OTHER-ITEMS-CAPITAL-AND-LIAB>               3,006,457
<TOT-CAPITALIZATION-AND-LIAB>                8,847,439
<GROSS-OPERATING-REVENUE>                    3,318,208
<INCOME-TAX-EXPENSE>                           267,673
<OTHER-OPERATING-EXPENSES>                   2,479,314
<TOTAL-OPERATING-EXPENSES>                   2,746,987
<OPERATING-INCOME-LOSS>                        571,221
<OTHER-INCOME-NET>                               2,392
<INCOME-BEFORE-INTEREST-EXPEN>                 573,613
<TOTAL-INTEREST-EXPENSE>                       174,554
<NET-INCOME>                                   386,497
<PREFERRED-STOCK-DIVIDENDS>                     12,562
<EARNINGS-AVAILABLE-FOR-COMM>                  386,497
<COMMON-STOCK-DIVIDENDS>                       348,527
<TOTAL-INTEREST-ON-BONDS>                      152,689
<CASH-FLOW-OPERATIONS>                         803,244
<EPS-PRIMARY>                                     2.82
<EPS-DILUTED>                                     2.82