<ARTICLE>                     UT
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
Statement of Income, Balance Sheet and Statement of Cash Flows, and is qualified
in its entirety by reference to such financial statements.
</LEGEND>

<MULTIPLIER>                             1000


                                     
<PERIOD-TYPE>                           12-MOS
<FISCAL-YEAR-END>                       DEC-31-1999
<PERIOD-END>                            DEC-31-1999
<BOOK-VALUE>                            PER-BOOK
<TOTAL-NET-UTILITY-PLANT>               4,240,012
<OTHER-PROPERTY-AND-INVEST>               391,731
<TOTAL-CURRENT-ASSETS>                  1,157,953
<TOTAL-DEFERRED-CHARGES>                  940,995
<OTHER-ASSETS>                                  0
<TOTAL-ASSETS>                          6,730,691
<COMMON>                                    1,338
<CAPITAL-SURPLUS-PAID-IN>               2,249,091
<RETAINED-EARNINGS>                       464,596
<TOTAL-COMMON-STOCKHOLDERS-EQ>          2,715,025
<PREFERRED-MANDATORY>                     363,000
<PREFERRED>                                84,339
<LONG-TERM-DEBT-NET>                    1,682,702
<SHORT-TERM-NOTES>                              0
<LONG-TERM-NOTES-PAYABLE>                 208,300
<COMMERCIAL-PAPER-OBLIGATIONS>                  0
<LONG-TERM-DEBT-CURRENT-PORT>                   0
<PREFERRED-STOCK-CURRENT>                       0
<CAPITAL-LEASE-OBLIGATIONS>                     0
<LEASES-CURRENT>                                0
<OTHER-ITEMS-CAPITAL-AND-LIAB>          1,677,325
<TOT-CAPITALIZATION-AND-LIAB>           6,730,691
<GROSS-OPERATING-REVENUE>               2,954,613
<INCOME-TAX-EXPENSE>                      136,362
<OTHER-OPERATING-EXPENSES>              2,472,444
<TOTAL-OPERATING-EXPENSES>              2,608,806
<OPERATING-INCOME-LOSS>                   345,807
<OTHER-INCOME-NET>                         37,496
<INCOME-BEFORE-INTEREST-EXPEN>            383,303
<TOTAL-INTEREST-EXPENSE>                  124,692
<NET-INCOME>                              258,611
<PREFERRED-STOCK-DIVIDENDS>                34,752
<EARNINGS-AVAILABLE-FOR-COMM>             223,859
<COMMON-STOCK-DIVIDENDS>                  246,251
<TOTAL-INTEREST-ON-BONDS>                 109,053
<CASH-FLOW-OPERATIONS>                    589,005
<EPS-BASIC>                                  1.62
<EPS-DILUTED>                                1.62