<ARTICLE>                                              UT
<LEGEND>
THIS  SCHEDULE  CONTAINS  SUMMARY  FINANCIAL   INFORMATION  EXTRACTED  FROM  THE
CONSOLIDATED BALANCE SHEETS,  CONSOLIDATED STATEMENTS OF INCOME AND CONSOLIDATED
STATEMENTS  OF CASH FLOWS AND IS  QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                                               1,000
       
                                                                  
<PERIOD-TYPE>                                                        3-MOS
<FISCAL-YEAR-END>                                                    DEC-31-1999
<PERIOD-START>                                                       JAN-01-1999
<PERIOD-END>                                                         MAR-31-1999
<BOOK-VALUE>                                                         PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                                             6,349,513
<OTHER-PROPERTY-AND-INVEST>                                                             645,250
<TOTAL-CURRENT-ASSETS>                                                                1,451,977
<TOTAL-DEFERRED-CHARGES>                                                                940,386
<OTHER-ASSETS>                                                                          459,022
<TOTAL-ASSETS>                                                                        9,846,148
<COMMON>                                                                                  1,588
<CAPITAL-SURPLUS-PAID-IN>                                                             1,598,884
<RETAINED-EARNINGS>                                                                     991,761
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                                        2,592,233
<PREFERRED-MANDATORY>                                                                         0
<PREFERRED>                                                                              92,616
<LONG-TERM-DEBT-NET>                                                                  2,605,657
<SHORT-TERM-NOTES>                                                                    1,052,811
<LONG-TERM-NOTES-PAYABLE>                                                                     0
<COMMERCIAL-PAPER-OBLIGATIONS>                                                                0
<LONG-TERM-DEBT-CURRENT-PORT>                                                            25,959
<PREFERRED-STOCK-CURRENT>                                                                     0
<CAPITAL-LEASE-OBLIGATIONS>                                                                   0
<LEASES-CURRENT>                                                                              0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                                        3,476,872
<TOT-CAPITALIZATION-AND-LIAB>                                                         9,846,148
<GROSS-OPERATING-REVENUE>                                                             1,402,279
<INCOME-TAX-EXPENSE>                                                                     77,564
<OTHER-OPERATING-EXPENSES>                                                            1,168,130
<TOTAL-OPERATING-EXPENSES>                                                            1,245,694
<OPERATING-INCOME-LOSS>                                                                 156,585
<OTHER-INCOME-NET>                                                                       32,796
<INCOME-BEFORE-INTEREST-EXPEN>                                                          189,381
<TOTAL-INTEREST-EXPENSE>                                                                 60,772
<NET-INCOME>                                                                            128,609
<PREFERRED-STOCK-DIVIDENDS>                                                               1,364
<EARNINGS-AVAILABLE-FOR-COMM>                                                           127,245
<COMMON-STOCK-DIVIDENDS>                                                                 71,422
<TOTAL-INTEREST-ON-BONDS>                                                                50,077
<CASH-FLOW-OPERATIONS>                                                                  142,652
<EPS-PRIMARY>                                                                              0.80
<EPS-DILUTED>                                                                              0.80