This article presents a review of the geothermal potential, the installed geothermal capacity, a comparison between geothermal energy and some other energies economically and environmentally, and projections and future policies of Turkey. Some useful suggestions and recommendations are also presented. The present study shows that there is an important geothermal potential in Turkey and geothermal energy has some advantages, such as being renewable, reliable, clean, and a cheap domestic energy resource. Although Turkey has a great geothermal potential, it uses only about 3% of this potential efficiently. When Turkey uses all of this potential, it can meet 14% of the total energy need. Therefore development studies and investments in this sector should be supported.