0001103804-16-000120 SC 13G 1 20160705 20160705 CALPINE CORP 0000916457 4911 770212977 DE 1231 SC 13G 34 005-48317 161750507 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 7138302000 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 VIKING GLOBAL INVESTORS LP 0001103804 134055118 DE 1231 SC 13G 55 RAILROAD AVENUE GREENWICH CT 06830 203-863-5062 55 RAILROAD AVENUE GREENWICH CT 06830 SC 13G 1 v13gCalpine.txt