<ARTICLE> UT
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    2,539,795
<OTHER-PROPERTY-AND-INVEST>                    928,257
<TOTAL-CURRENT-ASSETS>                         814,333
<TOTAL-DEFERRED-CHARGES>                     1,163,713
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               5,446,098
<COMMON>                                        61,164
<CAPITAL-SURPLUS-PAID-IN>                    1,193,019
<RETAINED-EARNINGS>                            403,203
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,672,615
<PREFERRED-MANDATORY>                           49,220
<PREFERRED>                                     43,000
<LONG-TERM-DEBT-NET>                         1,627,488
<SHORT-TERM-NOTES>                             233,175
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                  250,200
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>               1,570,400
<TOT-CAPITALIZATION-AND-LIAB>                5,446,098
<GROSS-OPERATING-REVENUE>                    1,268,311
<INCOME-TAX-EXPENSE>                            74,791
<OTHER-OPERATING-EXPENSES>                   1,006,100
<TOTAL-OPERATING-EXPENSES>                   1,080,891
<OPERATING-INCOME-LOSS>                        187,420
<OTHER-INCOME-NET>                              13,643
<INCOME-BEFORE-INTEREST-EXPEN>                 201,063
<TOTAL-INTEREST-EXPENSE>                        76,989
<NET-INCOME>                                   124,074
<PREFERRED-STOCK-DIVIDENDS>                      4,470
<EARNINGS-AVAILABLE-FOR-COMM>                  119,604
<COMMON-STOCK-DIVIDENDS>                        74,139
<TOTAL-INTEREST-ON-BONDS>                            0
<CASH-FLOW-OPERATIONS>                         128,916
<EPS-BASIC>                                       2.50
<EPS-DILUTED>                                     2.49