The Energy Department (DOE) is not backing down in its efforts to support clean energy companies, despite a Republican push to pummel the Obama administration for approving a $535 million loan guarantee to a now-bankrupt solar firm. The department could approve as many as 15 renewable energy loan guarantees by the end of the month when a program launched under the stimulus law ends. The approvals could open up the Obama administration to more criticism from Republicans, who have raised broad concerns about the administration’s investments in clean energy in the aftermath of the bankruptcy of California-based Solyndra. The 2009...