<ARTICLE> UT
<MULTIPLIER> 1,000,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               JUN-30-1997
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                       11,115
<OTHER-PROPERTY-AND-INVEST>                      3,728
<TOTAL-CURRENT-ASSETS>                           1,700
<TOTAL-DEFERRED-CHARGES>                         2,800
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                                  19,423
<COMMON>                                         3,564
<CAPITAL-SURPLUS-PAID-IN>                           16
<RETAINED-EARNINGS>                              1,467
<TOTAL-COMMON-STOCKHOLDERS-EQ>                   5,032
<PREFERRED-MANDATORY>                              180
<PREFERRED>                                        509
<LONG-TERM-DEBT-NET>                             8,083
<SHORT-TERM-NOTES>                                 584
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                      569
<PREFERRED-STOCK-CURRENT>                            0
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<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                   4,464
<TOT-CAPITALIZATION-AND-LIAB>                   19,423
<GROSS-OPERATING-REVENUE>                        3,490
<INCOME-TAX-EXPENSE>                               118
<OTHER-OPERATING-EXPENSES>                       2,819
<TOTAL-OPERATING-EXPENSES>                       2,937
<OPERATING-INCOME-LOSS>                            553
<OTHER-INCOME-NET>                                  13
<INCOME-BEFORE-INTEREST-EXPEN>                     566
<TOTAL-INTEREST-EXPENSE>                           296
<NET-INCOME>                                       270
<PREFERRED-STOCK-DIVIDENDS>                         21
<EARNINGS-AVAILABLE-FOR-COMM>                      249
<COMMON-STOCK-DIVIDENDS>                           237
<TOTAL-INTEREST-ON-BONDS>                            0
<CASH-FLOW-OPERATIONS>                             466
<EPS-PRIMARY>                                     1.35
<EPS-DILUTED>                                     1.35