<ARTICLE> UT
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    2,153,200
<OTHER-PROPERTY-AND-INVEST>                     17,600
<TOTAL-CURRENT-ASSETS>                         556,300
<TOTAL-DEFERRED-CHARGES>                       221,800
<OTHER-ASSETS>                                 204,200
<TOTAL-ASSETS>                               3,153,100
<COMMON>                                           400
<CAPITAL-SURPLUS-PAID-IN>                      769,100
<RETAINED-EARNINGS>                            526,000
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,295,500
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                     22,900
<LONG-TERM-DEBT-NET>                           661,200
<SHORT-TERM-NOTES>                               1,300
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                 123,100
<LONG-TERM-DEBT-CURRENT-PORT>                      400
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>               1,048,700
<TOT-CAPITALIZATION-AND-LIAB>                3,153,100
<GROSS-OPERATING-REVENUE>                    1,273,300
<INCOME-TAX-EXPENSE>                           121,100
<OTHER-OPERATING-EXPENSES>                     894,500
<TOTAL-OPERATING-EXPENSES>                   1,015,600
<OPERATING-INCOME-LOSS>                        257,700
<OTHER-INCOME-NET>                              14,500
<INCOME-BEFORE-INTEREST-EXPEN>                 272,200
<TOTAL-INTEREST-EXPENSE>                        79,800
<NET-INCOME>                                   192,400
<PREFERRED-STOCK-DIVIDENDS>                        900
<EARNINGS-AVAILABLE-FOR-COMM>                  191,500
<COMMON-STOCK-DIVIDENDS>                       130,300
<TOTAL-INTEREST-ON-BONDS>                       79,200
<CASH-FLOW-OPERATIONS>                         401,300
<EPS-BASIC>                                       4.65
<EPS-DILUTED>                                     4.65