EXHIBIT 12.1 CENTRAL POWER AND LIGHT COMPANY RATIO OF EARNINGS TO FIXED CHARGES FOR THE TWELVE MONTHS ENDED SEPTEMBER 30, 1996 (Thousands Except Ratio) (Unaudited) Operating Income $291,977 Adjustments: Income taxes 68,612 Provision for deferred income taxes 27,183 Deferred investment tax credits (5,789) Utility plant development costs, net of tax (15,481) Other income and deductions 6,714 Allowance for borrowed and equity funds used during construction 1,943 Mirror CWIP amortization 10,250 Earnings $385,409 Fixed Charges: Interest on long-term debt $110,100 Interest on short-term debt and other 19,071 Fixed Charges $129,171 Ratio of Earnings to Fixed Charges 2.98 =======