EXHIBIT 12(b) PUBLIC SERVICE COMPANY OF OKLAHOMA (CONSOLIDATED) RATIO OF EARNINGS TO FIXED CHARGES FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1995 (Thousands except Ratio) (Unaudited) Operating Income $111,769 Adjustments: Federal and state income taxes 37,491 Provision for deferred Federal and state income taxes 2,703 Deferred investment tax credits <2,789> Other income and deductions 2,274 Allowance for borrowed and equity funds used during construction 3,734 Interest portion of financing leases __ -------- Earnings $155,182 ======== Fixed Charges: Interest on long-term debt $ 29,594 Amortization of debt issuance cost __ Interest on short-term debt and other 6,355 Interest portion of financing leases __ -------- Fixed Charges $ 35,949 ======== Ratio of Earnings to Fixed Charges 4.32 ========