EXHIBIT 12.2 PUBLIC SERVICE COMPANY OF OKLAHOMA (CONSOLIDATED) RATIO OF EARNINGS TO FIXED CHARGES FOR THE TWELVE MONTHS ENDED SEPTEMBER 30, 1996 (Thousands Except Ratio) (Unaudited) Operating Income $105,927 Adjustments: Income taxes 29,841 Provision for deferred income taxes (5,054) Deferred investment tax credits (2,785) Utility plant development costs, net of tax (35,552) Other income and deductions 64 Allowance for borrowed and equity funds used during construction 1,272 Earnings $ 93,713 ======= Fixed Charges: Interest on long-term debt $ 30,334 Amortization of debt issuance cost 1,643 Other interest 4,276 ------- Fixed Charges $ 36,253 ======= Ratio of Earnings to Fixed Charges 2.58 =======