Exhibit 12.1 ILLINOVA CORPORATION STATEMENT OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES Twelve Six Months Ended Months Ended June June (Thousands of Dollars) As Restated 1999 1999 ** 1999 --------------------------- ------------ Earnings Available for Fixed Charges: Net Income (Loss) ($1,509,967) ($1,509,967) $35,627 Add: Income Taxes: Current (25,335) (25,335) (6,582) Deferred - Net 62,629 62,629 44,071 Allocated income taxes (18,754) (18,754) (14,798) Investment tax credit - deferred (5,539) (5,539) (729) Income tax effect of CPS impairment (1,143,252) (1,143,252) - Equity (Earnings) Loss in Subs (17,473) (17,473) (3,413) Interest on long-term debt 123,030 123,030 63,375 Amortization of debt expense and premium-net, and other interest charges 40,348 40,348 26,512 One-third of all rentals (Estimated to be representative of the interest component) 3,790 3,790 1,749 Interest on in-core fuel 5,223 5,223 3,274 CPS Impairment - 2,666,909 - ----------- ---------- -------- Earnings (loss) available for fixed charges ($2,485,300) $181,609 $149,086 =========== ========== ======== Fixed charges: Interest on long-term debt $123,030 $123,030 $63,375 Amortization of debt expense and premium-net, and other interest charges 48,922 48,922 29,184 One-third of all rentals (Estimated to be representative of the interest component) 3,790 3,790 1,749 Preferred stock dividend requirements 32,455 32,455 16,066 ----------- ---------- -------- Total Fixed Charges $208,197 $208,197 $110,374 =========== ========== ======== Ratio of earnings to fixed charges - * - 1.35 =========== ========== ======== * Earnings are inadequate to cover fixed charges. Additional earnings (thousands) $2,693,497 are required to attain a one-to-one ratio of Earnings to Fixed Charges. ** Supplemental ratio of earnings to fixed charges presented to exclude write-off related to Clinton Impairment. Additional earnings (thousands) of $26,858 are required to attain a one-to-one ratio of Earnings to Fixed Charges. 242