Exhibit 11 ---------- Environmental Power Corporation Computation of Earnings Per Share September 30, 2001 Income Shares Per Share (Numerator) (Denominator) Amounts ----------------- ----------------- ------------- Three Months Ended September 30, 2002: - -------------------------------------- Income attributable to shareholders $ 875,839 20,600,872 Effect of dividends to preferred stockholders of subsidiary (1,250) ----------------- ----------------- ------------- Basic EPS - Income attributable to common shareholders 874,589 20,600,872 $ 0.04 Effect of dilutive securities: Assumed exercise of dilutive stock options 106,803 ----------------- ----------------- ------------- Diluted EPS - Income attributable to common shareholders $ 874,589 20,707,675 $ 0.04 Three Months Ended September 30, 2001: - -------------------------------------- Income attributable to shareholders $ 922,030 15,547,945 Effect of dividends to preferred stockholders of subsidiary (1,250) ----------------- ----------------- ------------- Basic EPS - Income attributable to common shareholders 920,780 15,547,945 $ 0.06 Effect of dilutive securities: Assumed conversion of preferred stock 1,483,205 Assumed exercise of dilutive stock options 32,255 ----------------- ----------------- ------------- Diluted EPS - Income attributable to common shareholders $ 920,780 17,063,405 $ .05 ================= ================= ============= Income Shares Per Share (Numerator) (Denominator) Amounts ----------------- ----------------- ------------- Nine Months Ended September 30, 2002: - ------------------------------------- Income attributable to shareholders $ 899,981 20,298,245 Effect of dividends to preferred stockholders of subsidiary (3,750) ----------------- ----------------- ------------- Basic EPS - Income attributable to common shareholders 896,231 20,298,245 0.04 Effect of dilutive securities: Assumed exercise of dilutive stock options 83,761 ----------------- ----------------- ------------- Diluted EPS - Income attributable to common shareholders $ 896,230 20,382,005 $ 0.04 ================= ================= ============= Nine Months Ended September 30, 2001: - ------------------------------------- Income attributable to shareholders $ 1,692,496 12,802,339 Effect of dividends to preferred stockholders of subsidiary (3,750) ----------------- ----------------- ------------- Basic EPS - Income attributable to common shareholders 1,688,746 12,802,339 0.13 Effect of dilutive securities: 499,835 Assumed conversion of preferred stock Assumed exercise of dilutive stock options 20,503 ----------------- ----------------- ------------- Diluted EPS - Income attributable to common shareholders $ 1,688,746 13,322,677 $ 0.13 ================= ================= =============