Senate Coming Back Wtih Energy Bill

I know Lugar and Bayh voted against the House Bill but have not read anything about why. The Washington Post reports that the Senate is drafting its own Bill:

Democratic leaders in the Senate are planning a vote on a retooled energy bill late next week after they failed to muster enough support yesterday to prevent a filibuster of ambitious legislation passed by the House on Thursday.

A new version of the bill will probably scale back some elements of the House's tax package and jettison a requirement that electric utilities use renewable energy for 15 percent of their power generation, but a White House veto threat citing a broad range of objections continued to cast uncertainty over the ultimate fate of the proposed legislation.