<ARTICLE> UT

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    7,165,185
<OTHER-PROPERTY-AND-INVEST>                    253,236
<TOTAL-CURRENT-ASSETS>                         879,006
<TOTAL-DEFERRED-CHARGES>                        80,737
<OTHER-ASSETS>                                 799,451
<TOTAL-ASSETS>                               9,177,615
<COMMON>                                         1,372
<CAPITAL-SURPLUS-PAID-IN>                    1,582,501
<RETAINED-EARNINGS>                          1,505,827
<TOTAL-COMMON-STOCKHOLDERS-EQ>               3,089,700
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                    235,197
<LONG-TERM-DEBT-NET>                         2,343,138
<SHORT-TERM-NOTES>                              80,165
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                  117,444
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                    105,310
<LEASES-CURRENT>                                11,423
<OTHER-ITEMS-CAPITAL-AND-LIAB>               3,195,238
<TOT-CAPITALIZATION-AND-LIAB>                9,177,615
<GROSS-OPERATING-REVENUE>                    3,523,631
<INCOME-TAX-EXPENSE>                           258,870
<OTHER-OPERATING-EXPENSES>                   2,702,212
<TOTAL-OPERATING-EXPENSES>                   2,961,082
<OPERATING-INCOME-LOSS>                        562,549
<OTHER-INCOME-NET>                             (3,652)
<INCOME-BEFORE-INTEREST-EXPEN>                 558,897
<TOTAL-INTEREST-EXPENSE>                       161,152
<NET-INCOME>                                   385,095
<PREFERRED-STOCK-DIVIDENDS>                     12,650
<EARNINGS-AVAILABLE-FOR-COMM>                  385,095
<COMMON-STOCK-DIVIDENDS>                       348,527
<TOTAL-INTEREST-ON-BONDS>                      150,408
<CASH-FLOW-OPERATIONS>                         917,575
<EPS-BASIC>                                       2.81
<EPS-DILUTED>                                     2.81