<ARTICLE> UT

                             
<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>                    4,727,330
<OTHER-PROPERTY-AND-INVEST>                    598,563
<TOTAL-CURRENT-ASSETS>                         464,944
<TOTAL-DEFERRED-CHARGES>                     1,013,384
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               6,804,221
<COMMON>                                     1,540,437
<CAPITAL-SURPLUS-PAID-IN>                            0
<RETAINED-EARNINGS>                            629,444
<TOTAL-COMMON-STOCKHOLDERS-EQ>               2,169,881
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<LONG-TERM-DEBT-NET>                         2,164,459
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                 223,950
<LONG-TERM-DEBT-CURRENT-PORT>                   17,810
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>               2,228,121
<TOT-CAPITALIZATION-AND-LIAB>                6,804,221
<GROSS-OPERATING-REVENUE>                      982,647
<INCOME-TAX-EXPENSE>                            64,610
<OTHER-OPERATING-EXPENSES>                     510,296
<TOTAL-OPERATING-EXPENSES>                     742,080
<OPERATING-INCOME-LOSS>                        240,567
<OTHER-INCOME-NET>                             (2,954)
<INCOME-BEFORE-INTEREST-EXPEN>                       0
<TOTAL-INTEREST-EXPENSE>                        73,611
<NET-INCOME>                                    99,392
<PREFERRED-STOCK-DIVIDENDS>                          0
<EARNINGS-AVAILABLE-FOR-COMM>                   99,392
<COMMON-STOCK-DIVIDENDS>                        82,653
<TOTAL-INTEREST-ON-BONDS>                       55,936
<CASH-FLOW-OPERATIONS>                         330,176
<EPS-BASIC>                                       1.17
<EPS-DILUTED>                                     1.17