<TABLE> <S> <C>

<ARTICLE>  UT
<LEGEND>

THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
FROM (UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS AS OF MARCH 31,
1999) AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>1,000
       
<S>                                                                                   <C>
<PERIOD-TYPE>                                                                       3-MOS
<FISCAL-YEAR-END>                                                             DEC-31-1999
<PERIOD-END>                                                                  MAR-31-1999
<BOOK-VALUE>                                                                     PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                                      $6,325,171
<OTHER-PROPERTY-AND-INVEST>                                                      $392,680
<TOTAL-CURRENT-ASSETS>                                                           $801,615
<TOTAL-DEFERRED-CHARGES>                                                         $359,781
<OTHER-ASSETS>                                                                   $585,705
<TOTAL-ASSETS>                                                                 $8,464,952
<COMMON>                                                                       $1,234,231
<CAPITAL-SURPLUS-PAID-IN>                                                          ($790)
<RETAINED-EARNINGS>                                                            $1,747,409
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                                 $2,980,850
<PREFERRED-MANDATORY>                                                                  $0
<PREFERRED>                                                                       $59,376
<LONG-TERM-DEBT-NET>                                                           $2,604,585
<SHORT-TERM-NOTES>                                                                     $0
<LONG-TERM-NOTES-PAYABLE>                                                              $0
<COMMERCIAL-PAPER-OBLIGATIONS>                                                         $0
<LONG-TERM-DEBT-CURRENT-PORT>                                                    $201,611
<PREFERRED-STOCK-CURRENT>                                                              $0
<CAPITAL-LEASE-OBLIGATIONS>                                                            $0
<LEASES-CURRENT>                                                                       $0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                                 $2,618,530
<TOT-CAPITALIZATION-AND-LIAB>                                                  $8,464,952
<GROSS-OPERATING-REVENUE>                                                        $762,902
<INCOME-TAX-EXPENSE>                                                              $59,159
<OTHER-OPERATING-EXPENSES>                                                       $563,494
<TOTAL-OPERATING-EXPENSES>                                                       $622,653
<OPERATING-INCOME-LOSS>                                                          $199,408
<OTHER-INCOME-NET>                                                               ($4,703)
<INCOME-BEFORE-INTEREST-EXPEN>                                                   $135,546
<TOTAL-INTEREST-EXPENSE>                                                          $43,334
<NET-INCOME>                                                                      $92,212
<PREFERRED-STOCK-DIVIDENDS>                                                        ($742)
<EARNINGS-AVAILABLE-FOR-COMM>                                                     $91,470
<COMMON-STOCK-DIVIDENDS>                                                          $72,362
<TOTAL-INTEREST-ON-BONDS>                                                         $31,066
<CASH-FLOW-OPERATIONS>                                                           $221,800
<EPS-PRIMARY>                                                                        0.63
<EPS-DILUTED>                                                                        0.63
        

</TABLE>