1 EXHIBIT 21 Subsidiaries of Calpine Corporation Set forth below are the names of certain subsidiaries, at least 50% owned, directly or indirectly, of Calpine Corporation as of December 31, 1999, unless otherwise indicated. Certain subsidiaries which when considered in the aggregate would not constitute a significant subsidiary, are omitted from the list below: State or Other Calpine Jurisdiction of Incorporation Name Interest Percentage or Organization - ---- ------------------- ----------------------------- Geysers Power Company Geysers Power Company, LLC 100% Delaware Geysers Power I Company 100% Delaware Geysers Power II Company 100% Delaware Thermal Power Company 100% California Calpine Thermal Power, Inc. 100% California Geysers Finance Company 100% Delaware Texas City Power Plant Texas City Cogeneration, LP 100% Texas Texas Cogeneration One Company 100% Delaware Texas Cogeneration Five, Inc. 100% Delaware Texas Cogeneration Company 100% Delaware Calpine Finance Company 100% Delaware Pasadena Power Plant Pasadena Cogeneration, LP 100% Delaware Calpine Pasadena Cogeneration, Inc. 100% Delaware Calpine Texas Cogeneration, Inc. 100% Delaware King City Power Plant Calpine King City Cogen LLC 100% Delaware Calpine King City 1, Inc. 100% Delaware Calpine King City 2, Inc. 100% Delaware Calpine Securities Company, LP 100% Delaware Gilroy Power Plant Calpine Gilroy Cogen, LP 100% Delaware Calpine Gilroy 1, Inc. 100% Delaware Calpine Gilroy 2, Inc. 100% Delaware