Renewables and DOE Administrative Improvement Act : hearing before the Committee on Energy and Natural Resources, United States Senate, One Hundred Twelfth Congress, first session, to receive testimony on S. 1160, the Department of Energy Administrative Improvement Act of 2011, S. 1108, the 10 Million Solar Roofs Act of 2011, and S. 1142, the Geothermal Exploration and Technology Act of 2011, July 12, 2011