EXHIBIT 12 CENTRAL POWER AND LIGHT COMPANY (CONSOLIDATED) RATIO OF EARNINGS TO FIXED CHARGES FOR THE TWELVE MONTHS ENDED JUNE 30, 2000 (Thousands Except Ratio) (Unaudited) Operating Income $302,582 Adjustments Income taxes 73,190 Provision for deferred income taxes 27,785 Deferred investment tax credits (5,207) Other income and deductions 8,327 Allowance for borrowed and equity funds used during construction 6,266 Earnings $412,943 Fixed Charges: Interest on long-term debt $90,626 Interest on short-term debt and other 19,183 Distributions on Trust Preferred Securities 12,000 Fixed Charges $121,809 Ratio of Earnings to Fixed Charges 3.39