Describes two of the least environmentally disruptive sources of power by which electricity is generated today and details how they are used in practice to supply electricity to the power markets.

Electronic reproduction.

pt. 1. Solar energy: A brief history of solar power ; Sunlight and geometry ; Photovoltaics ; Heat engines and solar power ; Two other important solar technologies ; Economic and environmental consequences of solar power ; Government policies and solar energy -- pt. 2. Geothermal energy: A brief history of geothermal energy ; Geology and heat ; The generating station ; Two other geothermal technologies ; The economics and environmental impacts of electricity from geothermal sources ; Government policies and geothermal energy.