EXHIBIT 12.3 SOUTHWESTERN ELECTRIC POWER COMPANY (CONSOLIDATED) RATIO OF EARNINGS TO FIXED CHARGES FOR THE TWELVE MONTHS ENDED MARCH 31, 2000 (Thousands Except Ratio) (Unaudited) Operating Income $144,513 Adjustments Income taxes 44,325 Provision for deferred income taxes (7,846) Deferred investment tax credits (4,544) Other income and deductions (2,462) Allowance for borrowed and equity funds used during construction 2,352 Interest portion of financing leases 224 ------------ Earnings $176,562 ============ Fixed Charges: Interest on long-term debt $38,496 Interest on short-term debt and other 14,942 Distributions on Trust Preferred Securities 8,662 Interest portion of financing leases 224 ------------ Fixed Charges $62,324 ============ Ratio of Earnings to Fixed Charges 2.83 ============ 76