<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>                    204,986
<TOTAL-CURRENT-ASSETS>                         428,194
<TOTAL-DEFERRED-CHARGES>                     1,007,845
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               6,368,355
<COMMON>                                       178,162
<CAPITAL-SURPLUS-PAID-IN>                    1,196,804
<RETAINED-EARNINGS>                            575,607
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,950,573
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<LONG-TERM-DEBT-NET>                         1,955,137
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                 223,950
<LONG-TERM-DEBT-CURRENT-PORT>                   14,542
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>               2,224,153
<TOT-CAPITALIZATION-AND-LIAB>                6,368,355
<GROSS-OPERATING-REVENUE>                      925,417
<INCOME-TAX-EXPENSE>                            74,659
<OTHER-OPERATING-EXPENSES>                     685,299
<TOTAL-OPERATING-EXPENSES>                     759,958
<OPERATING-INCOME-LOSS>                        165,459
<OTHER-INCOME-NET>                               7,063
<INCOME-BEFORE-INTEREST-EXPEN>                 172,522
<TOTAL-INTEREST-EXPENSE>                        69,186
<NET-INCOME>                                   103,336
<PREFERRED-STOCK-DIVIDENDS>                      1,016
<EARNINGS-AVAILABLE-FOR-COMM>                  102,320
<COMMON-STOCK-DIVIDENDS>                       127,500
<TOTAL-INTEREST-ON-BONDS>                       55,936
<CASH-FLOW-OPERATIONS>                         333,189
<EPS-BASIC>                                          0
<EPS-DILUTED>                                        0