<Page> Exhibit 12.1 EME Homer City Generation LP Ratio of Earnings to Fixed Charges (000's) <Table> <Caption> Year Ended Year Ended Nine Months Ended Nine Months Ended December 31, December 31, September 30, September 30, 2000 1999 2001 2000 --------------------------------------------------------------- EARNINGS: Income (loss) before income taxes and extraordinary item (1999) (3,563) 4,290 57,545 9,489 Adjustments: Fixed charges, as below 149,149 105,860 112,438 111,367 Interest capitalized (10,282) (1,779) (9,651) (6,873) --------------------------------------------------------------- Earnings as adjusted 135,304 108,371 160,332 113,983 =============================================================== FIXED CHARGES: Interest on indebtedness (expense and capitalized) 148,936 105,593 112,248 111,207 Interest portion on rental expense 213 267 190 160 --------------------------------------------------------------- 149,149 105,860 112,438 111,367 =============================================================== Ratio of Earnings to Fixed Charges (a) -- 1.02 1.43 1.02 </Table> (a) For the year ended December 31, 2000, there was a fixed charge deficiency of $13,845 <Page> EME Homer City Generation LP Ratio of Earnings to Fixed Charges (000's) Pro forma <Table> <Caption> Year Ended Nine Months Ended December 31, September 30, 2000 2001 --------- --------- PRO FORMA EARNINGS: Historical income (loss) before income taxes $ (3,563) $ 57,545 Pro forma earnings adjustments due to sale-leaseback: Elimination of interest on debt to be repaid with proceeds from sale Additional interest expense from lease financing (105,000) (79,000) Adjustments: Fixed charges, as below 243,867 181,787 Interest capitalized - none -- -- --------- --------- Earnings as adjusted $ 135,304 $ 160,332 ========= ========= PRO FORMA FIXED CHARGES: Historical interest on indebtedness $ 148,936 $ 112,248 Pro forma interest adjustments due to sale-leaseback: Elimination of interest on debt to be repaid with proceeds from sale (10,282) (9,651) Additional interest expense from lease financing 105,000 79,000 Historical interest portion on rental expense 213 190 --------- --------- $ 243,867 $ 181,787 ========= ========= Pro forma ratio of Earnings to Fixed Charges -- (a) -- (a) </Table> (a) For the year ended December 31. 2000 and for the nine month period ended September 30, 2001, there was a pro forma fixed charge deficiency of $108,563 and $21,455, respectively.