<ARTICLE> UT
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               SEP-30-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    4,727,441
<OTHER-PROPERTY-AND-INVEST>                    212,517
<TOTAL-CURRENT-ASSETS>                         556,630
<TOTAL-DEFERRED-CHARGES>                       757,162
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               6,253,750
<COMMON>                                       178,162
<CAPITAL-SURPLUS-PAID-IN>                    1,196,804
<RETAINED-EARNINGS>                            565,230
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,940,196
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<LONG-TERM-DEBT-NET>                         1,812,262
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                 223,500
<LONG-TERM-DEBT-CURRENT-PORT>                  114,542
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>               2,163,250
<TOT-CAPITALIZATION-AND-LIAB>                6,253,750
<GROSS-OPERATING-REVENUE>                    1,792,921
<INCOME-TAX-EXPENSE>                           166,945
<OTHER-OPERATING-EXPENSES>                   1,309,603
<TOTAL-OPERATING-EXPENSES>                   1,476,548
<OPERATING-INCOME-LOSS>                        316,373
<OTHER-INCOME-NET>                              20,966
<INCOME-BEFORE-INTEREST-EXPEN>                 337,339
<TOTAL-INTEREST-EXPENSE>                       104,495
<NET-INCOME>                                    92,959
<PREFERRED-STOCK-DIVIDENDS>                      1,016
<EARNINGS-AVAILABLE-FOR-COMM>                   91,943
<COMMON-STOCK-DIVIDENDS>                       127,500
<TOTAL-INTEREST-ON-BONDS>                       81,594
<CASH-FLOW-OPERATIONS>                         532,129
<EPS-BASIC>                                          0
<EPS-DILUTED>                                        0