<ARTICLE> UT
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      2162800
<OTHER-PROPERTY-AND-INVEST>                      58000
<TOTAL-CURRENT-ASSETS>                          456800
<TOTAL-DEFERRED-CHARGES>                        246800
<OTHER-ASSETS>                                  998800
<TOTAL-ASSETS>                                 3923200
<COMMON>                                          1600
<CAPITAL-SURPLUS-PAID-IN>                       662100
<RETAINED-EARNINGS>                             700100
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 1363800
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                      22900
<LONG-TERM-DEBT-NET>                           1339000
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                   43800
<LONG-TERM-DEBT-CURRENT-PORT>                        0
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 1153700
<TOT-CAPITALIZATION-AND-LIAB>                  3923200
<GROSS-OPERATING-REVENUE>                       638900
<INCOME-TAX-EXPENSE>                             66900
<OTHER-OPERATING-EXPENSES>                      465000
<TOTAL-OPERATING-EXPENSES>                      531900
<OPERATING-INCOME-LOSS>                         107000
<OTHER-INCOME-NET>                               58400
<INCOME-BEFORE-INTEREST-EXPEN>                  165400
<TOTAL-INTEREST-EXPENSE>                         55100
<NET-INCOME>                                    110300
<PREFERRED-STOCK-DIVIDENDS>                        400
<EARNINGS-AVAILABLE-FOR-COMM>                   109900
<COMMON-STOCK-DIVIDENDS>                         71600
<TOTAL-INTEREST-ON-BONDS>                        50200
<CASH-FLOW-OPERATIONS>                          179500
<EPS-BASIC>                                       0.72
<EPS-DILUTED>                                     0.72