<TABLE> <S> <C>

<ARTICLE>  UT
<CIK>  0000081027
<NAME>  PUBLIC SERVICE COMPANY OF OKLAHOMA
<SUBSIDIARY>
<NUMBER> 004
<NAME>  PUBLIC SERVICE COMPANY OF OKLAHOMA
<MULTIPLIER> 1,000
       
<S>                                            <C>
<PERIOD-TYPE>                                  9-MOS
<FISCAL-YEAR-END>                                          DEC-31-1998
<PERIOD-END>                                               SEP-30-1998
<BOOK-VALUE>                                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                    1,303,317
<OTHER-PROPERTY-AND-INVEST>                                     20,590
<TOTAL-CURRENT-ASSETS>                                         104,821
<TOTAL-DEFERRED-CHARGES>                                         2,607
<OTHER-ASSETS>                                                  34,358
<TOTAL-ASSETS>                                               1,465,693
<COMMON>                                                       157,230
<CAPITAL-SURPLUS-PAID-IN>                                      180,000
<RETAINED-EARNINGS>                                            172,974
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                 510,204
<PREFERRED-MANDATORY>                                                0
<PREFERRED>                                                      5,287
<LONG-TERM-DEBT-NET>                                           402,724
<SHORT-TERM-NOTES>                                                   0
<LONG-TERM-NOTES-PAYABLE>                                       40,000
<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>                                 507,478
<TOT-CAPITALIZATION-AND-LIAB>                                1,465,693
<GROSS-OPERATING-REVENUE>                                      623,110
<INCOME-TAX-EXPENSE>                                            52,564
<OTHER-OPERATING-EXPENSES>                                     464,100
<TOTAL-OPERATING-EXPENSES>                                     516,664
<OPERATING-INCOME-LOSS>                                        106,446
<OTHER-INCOME-NET>                                                 973
<INCOME-BEFORE-INTEREST-EXPEN>                                 107,419
<TOTAL-INTEREST-EXPENSE>                                        29,281
<NET-INCOME>                                                    78,138
<PREFERRED-STOCK-DIVIDENDS>                                        160
<EARNINGS-AVAILABLE-FOR-COMM>                                   77,978
<COMMON-STOCK-DIVIDENDS>                                        42,000
<TOTAL-INTEREST-ON-BONDS>                                       21,666
<CASH-FLOW-OPERATIONS>                                         165,953
<EPS-PRIMARY>                                                     0.00
<EPS-DILUTED>                                                     0.00
        



</TABLE>