<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-31-1998 <PERIOD-END> DEC-31-1998 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 1,309,641 <OTHER-PROPERTY-AND-INVEST> 19,664 <TOTAL-CURRENT-ASSETS> 101,703 <TOTAL-DEFERRED-CHARGES> 1,983 <OTHER-ASSETS> 33,794 <TOTAL-ASSETS> 1,466,785 <COMMON> 157,230 <CAPITAL-SURPLUS-PAID-IN> 180,000 <RETAINED-EARNINGS> 144,626 <TOTAL-COMMON-STOCKHOLDERS-EQ> 481,856 <PREFERRED-MANDATORY> 0 <PREFERRED> 5,287 <LONG-TERM-DEBT-NET> 403,121 <SHORT-TERM-NOTES> 15,892 <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> 520,629 <TOT-CAPITALIZATION-AND-LIAB> 1,466,785 <GROSS-OPERATING-REVENUE> 780,159 <INCOME-TAX-EXPENSE> 49,099 <OTHER-OPERATING-EXPENSES> 616,052 <TOTAL-OPERATING-EXPENSES> 665,151 <OPERATING-INCOME-LOSS> 115,008 <OTHER-INCOME-NET> (91) <INCOME-BEFORE-INTEREST-EXPEN> 114,917 <TOTAL-INTEREST-EXPENSE> 38,074 <NET-INCOME> 76,843 <PREFERRED-STOCK-DIVIDENDS> 213 <EARNINGS-AVAILABLE-FOR-COMM> 76,630 <COMMON-STOCK-DIVIDENDS> 69,000 <TOTAL-INTEREST-ON-BONDS> 26,706 <CASH-FLOW-OPERATIONS> 193,093 <EPS-PRIMARY> 0.00 <EPS-DILUTED> 0.00