geothermal power generation using the binary cycle. The development of an advanced binary cycle is discussed in the light of the type of geotherraal fluid available, efficient utilization of geothermal heat, ami the thermodynamics of the power cycle. Using the Imperial Vai^ as a bsuis, case studies are developed for various geothermal revious. The economics of power generation using the binary cycle Environmental considerations are outlined. Areas is need of feturc research and development are specified.