0000916457-05-000043 NT 10-Q 1 20050331 20050511 20050510 20050511 CALPINE CORP 0000916457 4911 770212977 DE 1231 NT 10-Q 34 001-12079 05818603 50 WEST SAN FERNANDO ST SAN JOSE CA 95113 4089955115 50 W SAN FERNANDO SUITE 500 SAN JOSE CA 95113 NT 10-Q 1 q12005.txt