<ARTICLE>                                           UT
<MULTIPLIER>                                     1,000

                             
<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>                         1,048,717
<OTHER-PROPERTY-AND-INVEST>                       119,627
<TOTAL-CURRENT-ASSETS>                            192,108
<TOTAL-DEFERRED-CHARGES>                          10,666
<OTHER-ASSETS>                                    300,188
<TOTAL-ASSETS>                                    1,671,306
<COMMON>                                          282,271
<CAPITAL-SURPLUS-PAID-IN>                         (31)
<RETAINED-EARNINGS>                               167,378
<TOTAL-COMMON-STOCKHOLDERS-EQ>                    449,618
<PREFERRED-MANDATORY>                             0
<PREFERRED>                                       0
<LONG-TERM-DEBT-NET>                              518,191
<SHORT-TERM-NOTES>                                0
<LONG-TERM-NOTES-PAYABLE>                         48,684
<COMMERCIAL-PAPER-OBLIGATIONS>                    0
<LONG-TERM-DEBT-CURRENT-PORT>                     6,806
<PREFERRED-STOCK-CURRENT>                         0
<CAPITAL-LEASE-OBLIGATIONS>                       16,322
<LEASES-CURRENT>                                  361
<OTHER-ITEMS-CAPITAL-AND-LIAB>                    631,324
<TOT-CAPITALIZATION-AND-LIAB>                     1,671,306
<GROSS-OPERATING-REVENUE>                         333,200
<INCOME-TAX-EXPENSE>                              31,376
<OTHER-OPERATING-EXPENSES>                        253,424
<TOTAL-OPERATING-EXPENSES>                        284,800
<OPERATING-INCOME-LOSS>                           48,400
<OTHER-INCOME-NET>                                57
<INCOME-BEFORE-INTEREST-EXPEN>                    48,457
<TOTAL-INTEREST-EXPENSE>                          24,570
<NET-INCOME>                                      23,887
<PREFERRED-STOCK-DIVIDENDS>                       66
<EARNINGS-AVAILABLE-FOR-COMM>                     23,768
<COMMON-STOCK-DIVIDENDS>                          20,225
<TOTAL-INTEREST-ON-BONDS>                         32,368
<CASH-FLOW-OPERATIONS>                            16,000
<EPS-BASIC>                                     1.69
<EPS-DILUTED>                                     1.69