EXHIBIT 11 CALPINE CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (in thousands, except per share amounts) (unaudited) Three Months Ended Six Months Ended June 30, June 30, ------------------------- ------------------------ 1997 1996 1997 1996 --------- --------- --------- --------- Net income (loss) $ 9,400 $ 4,717 $ 5,360 $ 4,423 ========= ========= ========= ========= Primary earnings per share Weighted average number of common shares outstanding 19,911 10,388 19,882 10,388 Conversion of preferred stock -- 2,179 -- 1,221 Common shares issuable upon exercise of stock options using the treasury method 1,087 795 543 398 --------- --------- --------- --------- 20,998 13,362 20,425 12,007 ========= ========= ========= ========= Primary earnings per share $ 0.45 $ 0.35 $ 0.26 $ 0.37 ========= ========= ========= ========= Fully diluted earnings per share Weighted average number of common shares outstanding 19,911 10,388 19,882 10,388 Conversion of preferred stock -- 2,179 -- 1,221 Common shares issuable upon exercise of stock options using the treasury method 1,106 795 1,106 795 --------- --------- --------- --------- 21,017 13,362 20,988 12,404 ========= ========= ========= ========= Fully diluted earnings per share $ 0.45 $ 0.35 $ 0.26 $ 0.36 ========= ========= ========= =========