Geothermal energy is known today as one of the alternative renewable energy sources which has proven itself technically and economically to be feasible. It is commercially available to the public as a nonpollutant electric power source. Worldwide, 17 countries now operate geothermal power plants. The total usable capacity is 5 gigawatts, with units varying in capacity from a few hundred kilowatts to 135 megawatts (Di Pippo, 1988). The discovered untapped reserves, however, are measured in the tens of gigawatts (Di Pippo, 1988). This article aims at reviewing the potential of the geothermal resources in northwest Iran and looks to the future for possible growth scenarios in Iran.