Energy Policy Act of 2005 Pub. L. 109-58(codified in scattered sections throughout titles 16, 22, 26, and 42 of the United States Code). Among other things, this act authorized loan guarantees for "innovative" energy technologies that avoid creating greenhouse gases; authorized subsidies for wind and other alternative energy sources; increased the amount of biofuel that must be mixed with gasoline sold in the United States; and provided tax breaks to homeowners who make energy conservation improvements to their homes.