This document contains a summary of the proposed Energy Policy Act of 2005 (S. 517). It discusses key provisions of the bill, including establishing a cap-and-trade program for greenhouse gas emissions similar to the Kyoto Protocol, requiring 25% of the nation's electricity come from renewable sources by 2020 through a renewable portfolio standard, and debate around other proposed climate change bills. The summary criticizes the renewable portfolio standard provision as an unwarranted federal mandate that could grow entitlement spending and undermine energy productivity.