0001140361-12-052725 4 1 20121221 20121226 20121226 Hill Thad 0001351761 4 34 001-12079 121285950 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 CALPINE CORP 0000916457 4911 770212977 DE 1231 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 7138302000 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 4 1 doc1.xml FORM 4