Solar panel installer SolarCity said on Friday it was the second company in as many days that will not get finalization of U.S. government loan aid by a September 30 deadline. The Department of Energy informed SolarCity of its inability to close the loan 48 hours ago, blaming increased paperwork resulting from a Congressional investigation into the Department of Energy's $535 million loan guarantee awarded to bankrupt solar company Solyndra, SolarCity said in a letter to the Republican lawmakers heading the probe.The DOE loan guarantee program, which is under fire for missing signs its first recipient of loan aid, Solyndra,...