EXHIBIT 11 CALPINE CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (in thousands, except per share amounts) (unaudited) Three Months Ended Nine Months Ended September 30, September 30, ------------------------- ----------------------- 1997 1996 1997 1996 --------- --------- -------- -------- Net income $ 19,147 $ 10,732 $ 24,507 $ 15,155 ========= ========= ======== ======== Primary earnings per share Weighted average number of common shares outstanding 19,976 11,044 19,913 10,606 Conversion of preferred stock -- 2,179 -- 1,541 Common shares issuable upon exercise of stock options using the treasury method 1,080 847 722 548 --------- --------- -------- -------- $ 21,056 $ 14,070 $ 20,635 $ 12,695 --------- --------- -------- -------- Primary earnings per share $ 0.91 $ 0.76 $ 1.19 $ 1.19 ========= ========= ======== ======== Fully diluted earnings per share Weighted average number of common shares outstanding 19,976 11,044 19,913 10,606 Conversion of preferred stock -- 2,179 -- 1,541 Common shares issuable upon exercise of stock options using the treasury method 1,110 1,080 1,110 1,080 --------- --------- -------- -------- 21,086 14,303 $ 21,023 13,227 --------- --------- -------- -------- Fully diluted earnings per share $ 0.91 $ 0.75 $ 1.17 $ 1.15 ========= ========= ======== ========