<ARTICLE>  UT
<MULTIPLIER> 1,000
                                
<PERIOD-TYPE>                      6-MOS
<FISCAL-YEAR-END>                      Dec-31-2000
<PERIOD-END>                           Jun-30-2000
<BOOK-VALUE>                             PER-BOOK
<TOTAL-NET-UTILITY-PLANT>               2,416,089
<OTHER-PROPERTY-AND-INVEST>               384,815
<TOTAL-CURRENT-ASSETS>                    197,903
<TOTAL-DEFERRED-CHARGES>                  220,984
<OTHER-ASSETS>                                  0
<TOTAL-ASSETS>                          3,219,791
<COMMON>                                  449,697
<CAPITAL-SURPLUS-PAID-IN>                  (1,668)
<RETAINED-EARNINGS>                       424,163
<TOTAL-COMMON-STOCKHOLDERS-EQ>            872,192
<PREFERRED-MANDATORY>                          62
<PREFERRED>                                39,000
<LONG-TERM-DEBT-NET>                      955,943
<SHORT-TERM-NOTES>                              0
<LONG-TERM-NOTES-PAYABLE>                       0
<COMMERCIAL-PAPER-OBLIGATIONS>            159,360
<LONG-TERM-DEBT-CURRENT-PORT>              73,957
<PREFERRED-STOCK-CURRENT>                       0
<CAPITAL-LEASE-OBLIGATIONS>                     0
<LEASES-CURRENT>                                0
<OTHER-ITEMS-CAPITAL-AND-LIAB>          1,119,277
<TOT-CAPITALIZATION-AND-LIAB>           3,219,791
<GROSS-OPERATING-REVENUE>                 418,359
<INCOME-TAX-EXPENSE>                       19,259
<OTHER-OPERATING-EXPENSES>                341,888
<TOTAL-OPERATING-EXPENSES>                361,147
<OPERATING-INCOME-LOSS>                    57,212
<OTHER-INCOME-NET>                          6,471
<INCOME-BEFORE-INTEREST-EXPEN>             63,683
<TOTAL-INTEREST-EXPENSE>                   36,368
<NET-INCOME>                               57,388
<PREFERRED-STOCK-DIVIDENDS>                   824
<EARNINGS-AVAILABLE-FOR-COMM>              56,564
<COMMON-STOCK-DIVIDENDS>                   51,353
<TOTAL-INTEREST-ON-BONDS>                  28,739
<CASH-FLOW-OPERATIONS>                    143,985
<EPS-BASIC>                                0.91
<EPS-DILUTED>                                0.91