0001193125-12-056425 SC 13D/A 1 20120213 20120213 EDWARD H. MCDERMOTT J. STUART RYAN JOHN H. SCULLY PHOEBE SNOW FOUNDATION, INC. SAN FRANCISCO PARTNERS, L.P. SF ADVISORY PARTNERS, L.P. SPO ADVISORY PARTNERS, L.P. SPO PARTNERS II CO-INVESTMENT PARTNERSHIP, L.P. SPO PARTNERS II, L.P. WILLIAM E. OBERNDORF CALPINE CORP 0000916457 4911 770212977 DE 1231 SC 13D/A 34 005-48317 12599694 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 7138302000 717 TEXAS AVENUE SUITE 1000 HOUSTON TX 77002 SPO ADVISORY CORP 0000919468 680247274 DE 1231 SC 13D/A 591 REDWOOD HIGHWAY SUITE 3215 MILL VALLEY CA 94941 4153836600 591 REDWOOD HIGHWAY SUITE 3215 MILL VALLEY CA 94941 SF ADVISORY CORP 19990329 SC 13D/A 1 d300067dsc13da.htm SCHEDULE 13D - AMENDMENT 8