EXHIBIT 12 CENTRAL POWER AND LIGHT COMPANY (CONSOLIDATED) RATIO OF EARNINGS TO FIXED CHARGES FOR THE TWELVE MONTHS ENDED SEPTEMBER 30, 2000 (Thousands Except Ratio) (Unaudited) Operating Income $295,735 Adjustments Income taxes 75,310 Provision for deferred income taxes 34,331 Deferred investment tax credits (5,207) Other income and deductions 7,066 Allowance for borrowed and equity funds used during construction 6,681 Earnings $413,916 Fixed Charges: Interest on long-term debt $94,059 Interest on short-term debt and other 22,083 Distributions on Trust Preferred Securities 11,990 Fixed Charges $128,132 Ratio of Earnings to Fixed Charges 3.23