Hearing Before the Committee on Energy and Natural Resources, United States Senate, One Hundred Tenth Congress, First Session, to Receive Testimony on S. 1543, a Bill to Establish a National Geothermal Initiative to Encourage Increased Production of Energy from Geothermal Resources by Creating a Program of Geothermal Research, Development, Demonstration and Commercial Application to Support the Achievement of a National Geothermal Energy Goal, September 26, 2007