<ARTICLE> UT
<LEGEND>
This schedule contains summary financial information extracted from the
Consolidated Balance Sheet at 6/30/98, the Consolidated Income Statement and the
Consolidated Statement of Cash Flows for the six months ended 6/30/98 and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    1,509,898
<OTHER-PROPERTY-AND-INVEST>                    679,356
<TOTAL-CURRENT-ASSETS>                         269,529
<TOTAL-DEFERRED-CHARGES>                       368,250
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               2,827,033
<COMMON>                                       700,603
<CAPITAL-SURPLUS-PAID-IN>                        2,232
<RETAINED-EARNINGS>                            323,072
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,025,907
<PREFERRED-MANDATORY>                           65,000
<PREFERRED>                                     57,654
<LONG-TERM-DEBT-NET>                           725,032
<SHORT-TERM-NOTES>                              84,939
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                   63,544
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                        722
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 804,235
<TOT-CAPITALIZATION-AND-LIAB>                2,827,033
<GROSS-OPERATING-REVENUE>                      544,870
<INCOME-TAX-EXPENSE>                            25,625
<OTHER-OPERATING-EXPENSES>                     431,026
<TOTAL-OPERATING-EXPENSES>                     456,651
<OPERATING-INCOME-LOSS>                         88,219
<OTHER-INCOME-NET>                               1,847
<INCOME-BEFORE-INTEREST-EXPEN>                  90,066
<TOTAL-INTEREST-EXPENSE>                        31,647
<NET-INCOME>                                    58,419
<PREFERRED-STOCK-DIVIDENDS>                      1,845
<EARNINGS-AVAILABLE-FOR-COMM>                   56,574
<COMMON-STOCK-DIVIDENDS>                        43,970
<TOTAL-INTEREST-ON-BONDS>                            0
<CASH-FLOW-OPERATIONS>                          96,118
<EPS-PRIMARY>                                     1.03
<EPS-DILUTED>                                     1.03