<ARTICLE>                                   UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS, CONSOLIDATED STATEMENTS OF INCOME AND CONSOLIDATED
STATEMENTS OF CASH FLOWS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                                      1,000

                                                  
<PERIOD-TYPE>                                        3-MOS
<FISCAL-YEAR-END>                                    DEC-31-1999
<PERIOD-START>                                       APR-01-1999
<PERIOD-END>                                         JUN-30-1999
<BOOK-VALUE>                                         PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                     6,370,228
<OTHER-PROPERTY-AND-INVEST>                                     616,347
<TOTAL-CURRENT-ASSETS>                                          950,458
<TOTAL-DEFERRED-CHARGES>                                        911,754
<OTHER-ASSETS>                                                  544,062
<TOTAL-ASSETS>                                                9,392,849
<COMMON>                                                          1,589
<CAPITAL-SURPLUS-PAID-IN>                                     1,602,608
<RETAINED-EARNINGS>                                             978,239
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                2,582,436
<PREFERRED-MANDATORY>                                                 0
<PREFERRED>                                                      92,606
<LONG-TERM-DEBT-NET>                                          2,782,798
<SHORT-TERM-NOTES>                                              837,184
<LONG-TERM-NOTES-PAYABLE>                                             0
<COMMERCIAL-PAPER-OBLIGATIONS>                                        0
<LONG-TERM-DEBT-CURRENT-PORT>                                    25,959
<PREFERRED-STOCK-CURRENT>                                             0
<CAPITAL-LEASE-OBLIGATIONS>                                           0
<LEASES-CURRENT>                                                      0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                3,071,866
<TOT-CAPITALIZATION-AND-LIAB>                                 9,392,849
<GROSS-OPERATING-REVENUE>                                     1,275,399
<INCOME-TAX-EXPENSE>                                             29,120
<OTHER-OPERATING-EXPENSES>                                    1,138,289
<TOTAL-OPERATING-EXPENSES>                                    1,167,409
<OPERATING-INCOME-LOSS>                                         107,990
<OTHER-INCOME-NET>                                               13,214
<INCOME-BEFORE-INTEREST-EXPEN>                                  121,204
<TOTAL-INTEREST-EXPENSE>                                         60,781
<NET-INCOME>                                                     60,423
<PREFERRED-STOCK-DIVIDENDS>                                       1,365
<EARNINGS-AVAILABLE-FOR-COMM>                                    59,058
<COMMON-STOCK-DIVIDENDS>                                         71,492
<TOTAL-INTEREST-ON-BONDS>                                        51,770
<CASH-FLOW-OPERATIONS>                                          313,805
<EPS-BASIC>                                                      0.37
<EPS-DILUTED>                                                      0.37