<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>                    1,826,860
<OTHER-PROPERTY-AND-INVEST>                    212,155
<TOTAL-CURRENT-ASSETS>                         386,471
<TOTAL-DEFERRED-CHARGES>                       762,627
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               3,188,113
<COMMON>                                             0
<CAPITAL-SURPLUS-PAID-IN>                      741,570
<RETAINED-EARNINGS>                            310,215
<TOTAL-COMMON-STOCKHOLDERS-EQ>               1,051,785
<PREFERRED-MANDATORY>                           49,160
<PREFERRED>                                     43,000
<LONG-TERM-DEBT-NET>                           880,057
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                   66,467
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>               1,097,644
<TOT-CAPITALIZATION-AND-LIAB>                3,188,113
<GROSS-OPERATING-REVENUE>                      750,339
<INCOME-TAX-EXPENSE>                            40,377
<OTHER-OPERATING-EXPENSES>                     605,954
<TOTAL-OPERATING-EXPENSES>                     646,331
<OPERATING-INCOME-LOSS>                        104,008
<OTHER-INCOME-NET>                               1,874
<INCOME-BEFORE-INTEREST-EXPEN>                 105,882
<TOTAL-INTEREST-EXPENSE>                        39,846
<NET-INCOME>                                    66,036
<PREFERRED-STOCK-DIVIDENDS>                      2,980
<EARNINGS-AVAILABLE-FOR-COMM>                        0
<COMMON-STOCK-DIVIDENDS>                             0
<TOTAL-INTEREST-ON-BONDS>                            0
<CASH-FLOW-OPERATIONS>                          69,424
<EPS-BASIC>                                          0
<EPS-DILUTED>                                        0