NEW YORK (Standard&Poor's) Dec. 21, 2005--Standard&Poor's Rating Services lowered its ratings on electric power giant Calpine Corp. and some of its subsidiaries to 'D' after the company filed for Chapter 11 bankruptcy protection. The San Jose, Calif.-based company, which develops, acquires, owns, and operates power generation facilities, has about $18 billion of total debt outstanding. At the same time, the recovery ratings for Calpine and its subsidiaries remain at their current level, but are placed on CreditWatch with negative implications. Standard&Poor's will review any financials and restructuring plans that may become available to assess the effect on recovery prospects. If sufficient information is not available in the near term, Standard&Poor's will withdraw