Potential sources of geothermal energy. To be mentioned here. A potential source of energy is high, and a potential source of high energy medium. The source of potential energy is relatively high. It's the temperature in the reservoir above 180 ° C and a suitable geological structure that can store a lot of hot water and the level is not very deep. As shown in Table 8.1 are a potential source of energy is the source of medium height, with a temperature between 140-180 degrees Celsius in the reservoirs are geological structure that can store large amounts of hot water as well. As shown in Table 8.2.