Exhibit (12) Commonwealth Edison Company Form 10-K File No. 1-1839 Commonwealth Edison Company and Subsidiary Companies Consolidated ----------------------------------------------------------------- Computation of Ratios of Earnings to Fixed Charges and Ratios of Earnings to Fixed Charges and Preferred and Preference Stock Dividend Requirements -------------------------------------------------------- - Thousands of Dollars - Twelve Months Ended ----------------------------- Line December 31, December 31, No. 1992 1993 - ---- ------------ ------------ 1 Net income $ 513,981 $112,440 ---------- -------- 2 Net provisions for income taxes and investment 3 tax credits deferred charged to- 4 Operations $ 272,547 $ 65,827 5 Cumulative effect of change in accounting for income taxes - (9,738) 6 Other income (6,549) (30,753) ---------- -------- 7 $ 265,998 $ 25,336 ---------- -------- 8 Fixed charges- 9 Interest on debt $ 661,348 $651,639 10 Estimated interest component of nuclear fuel and 11 other lease payments, rentals and other interest 53,348 49,021 12 Amortization of debt discount, premium and expense 20,178 20,966 ---------- -------- 13 $ 734,874 $721,626 ---------- -------- 14 Preferred and preference stock dividend requirements- 15 Provisions for preferred and preference stock dividends $ 70,539 $ 66,052 16 Taxes on income required to meet provisions for 17 preferred and preference stock dividends 44,646 43,596 ---------- -------- 18 $ 115,185 $109,648 ---------- -------- 19 Fixed charges and preferred and preference stock 20 dividend requirements $ 850,059 $831,274 ---------- -------- 21 Earned for fixed charges and preferred and preference stock 22 dividend requirements $1,514,853 $859,402 ---------- -------- 23 Ratios of earnings to fixed charges (line 22 divided by line 13) 2.06 1.19 ==== ==== 24 Ratios of earnings to fixed charges and preferred 25 and preference stock dividend requirements (line 22 divided by line 20) 1.78 1.03 ==== ====