Geothermal energy initiative : 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.