0000916457-15-000022 DEFA14A 3 20150331 20150331 20150331 CALPINE CORP 0000916457 4911 770212977 DE 1231 DEFA14A 34 001-12079 15740015 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 7138302000 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 DEFA14A 1 schedulea14a-definitiveadd.htm DEFINITIVE ADDITIONAL MATERIALS FOR 2015 PROXY GRAPHIC 2 calpinelogoa02a01a01.gif CALPINE LOGO GRAPHIC 3 xbox.jpg