EXHIBIT 12 ONCOR ELECTRIC DELIVERY COMPANY RATIO OF EARNINGS TO FIXED CHARGES MILLIONS OF DOLLARS NINE MONTHS ENDED SEPTEMBER 30, ----------------- 2002 2001 EARNINGS: Net income (loss) 232 176 Add: Total federal income taxes (benefit) 118 94 Fixed charges (see detail below) 200 223 Preferred dividends of subsidiaries 0 0 ---- ---- Total earnings 550 493 ==== ==== FIXED CHARGES: Interest expense 197 219 Rentals representative of the interest factor 3 4 Distributions on preferred trust securities of subsidiaries 0 0 ---- ---- Fixed charges deducted from earnings 200 223 Preferred dividends of subsidiaries (pretax) 0 0 ---- ---- Total fixed charges 200 223 Preferred dividends of registrant (pretax) 0 0 ---- ---- Fixed charges and preferred dividends 200 223 ==== ==== RATIO OF EARNINGS TO FIXED CHARGES 2.75 2.21 ==== ==== RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDENDS 2.75 2.21 ==== ====