<ARTICLE>                                           UT
<MULTIPLIER>                  1,000

                                            
<PERIOD-TYPE>                                  6-MOS
<FISCAL-YEAR-END>                              DEC-31-2000
<PERIOD-START>                                 JAN-01-2000
<PERIOD-END>                                   JUN-30-2000
<BOOK-VALUE>                                   PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      3,790,260
<OTHER-PROPERTY-AND-INVEST>                    214,019
<TOTAL-CURRENT-ASSETS>                         504,058
<TOTAL-DEFERRED-CHARGES>                       0
<OTHER-ASSETS>                                 624,577
<TOTAL-ASSETS>                                 5,132,914
<COMMON>                                       853,643
<CAPITAL-SURPLUS-PAID-IN>                      461,617
<RETAINED-EARNINGS>                            96,012
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 1,411,272
<PREFERRED-MANDATORY>                          58,162
<PREFERRED>                                    60,000
<LONG-TERM-DEBT-NET>                           1,914,788
<SHORT-TERM-NOTES>                             191,250
<LONG-TERM-NOTES-PAYABLE>                      0
<COMMERCIAL-PAPER-OBLIGATIONS>                 267,037
<LONG-TERM-DEBT-CURRENT-PORT>                  25,000
<PREFERRED-STOCK-CURRENT>                      0
<CAPITAL-LEASE-OBLIGATIONS>                    0
<LEASES-CURRENT>                               0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 1,205,405
<TOT-CAPITALIZATION-AND-LIAB>                  5,132,914
<GROSS-OPERATING-REVENUE>                      1,186,024
<INCOME-TAX-EXPENSE>                           66,250
<OTHER-OPERATING-EXPENSES>                     940,770
<TOTAL-OPERATING-EXPENSES>                     1,007,020
<OPERATING-INCOME-LOSS>                        179,004
<OTHER-INCOME-NET>                             11,268
<INCOME-BEFORE-INTEREST-EXPEN>                 190,272
<TOTAL-INTEREST-EXPENSE>                       84,711
<NET-INCOME>                                   105,561
<PREFERRED-STOCK-DIVIDENDS>                    4,532
<EARNINGS-AVAILABLE-FOR-COMM>                  101,029
<COMMON-STOCK-DIVIDENDS>                       78,268
<TOTAL-INTEREST-ON-BONDS>                      72,315
<CASH-FLOW-OPERATIONS>                         237,662
<EPS-BASIC>                                    1.19
<EPS-DILUTED>                                  1.18