<ARTICLE>  UT
<CIK>   0000081027
<NAME>  PUBLIC SERVICE COMPANY OF OKLAHOMA
<SUBSIDIARY>
<NUMBER> 004
<NAME>  PUBLIC SERVICE COMPANY OF OKLAHOMA
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                    DEC-31-1999
<PERIOD-END>                         MAR-31-1999
<BOOK-VALUE>                            PER-BOOK
<TOTAL-NET-UTILITY-PLANT>              1,311,251
<OTHER-PROPERTY-AND-INVEST>               19,905
<TOTAL-CURRENT-ASSETS>                   102,850
<TOTAL-DEFERRED-CHARGES>                   1,779
<OTHER-ASSETS>                            50,125
<TOTAL-ASSETS>                         1,485,910
<COMMON>                                 157,230
<CAPITAL-SURPLUS-PAID-IN>                180,000
<RETAINED-EARNINGS>                      132,493
<TOTAL-COMMON-STOCKHOLDERS-EQ>           469,723
<PREFERRED-MANDATORY>                          0
<PREFERRED>                                5,287
<LONG-TERM-DEBT-NET>                     419,144
<SHORT-TERM-NOTES>                        46,793
<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>           504,963
<TOT-CAPITALIZATION-AND-LIAB>          1,485,910
<GROSS-OPERATING-REVENUE>                151,030
<INCOME-TAX-EXPENSE>                       1,143
<OTHER-OPERATING-EXPENSES>               137,359
<TOTAL-OPERATING-EXPENSES>               138,502
<OPERATING-INCOME-LOSS>                   12,528
<OTHER-INCOME-NET>                          (521)
<INCOME-BEFORE-INTEREST-EXPEN>            12,007
<TOTAL-INTEREST-EXPENSE>                   9,087
<NET-INCOME>                               2,920
<PREFERRED-STOCK-DIVIDENDS>                   53
<EARNINGS-AVAILABLE-FOR-COMM>              2,867
<COMMON-STOCK-DIVIDENDS>                  15,000
<TOTAL-INTEREST-ON-BONDS>                  6,002
<CASH-FLOW-OPERATIONS>                       259
<EPS-PRIMARY>                               0.00
<EPS-DILUTED>                               0.00