Geothermal did not play a role much in the past because of many reasons. Firstly, it has a very high cost. In ancient time, many countries encountered with the high energy prices of geothermal such as Denmark and Germany due to the growing interest in controversial alternatives (The Economist, 2014). At that moment, other renewable resources have more popular than geothermal (Figure 1). For instance, solarpower is the most popular because the innovation of solar power has rapidlydeveloped by supporting the payment from the government. Moreover, wind poweris also popular due to it is the cheapest renewable energy sources(Ammonit.com, 2015). Secondly, the technology of geothermal was not developed yet. According to the past decades, geothermal did not play a role much, so the scientists did not concentrate to develop this renewable resource.And it was also did not get any supporting from the government. For this reason, it makes geothermal costs are very high. Furthermore, with the technology has not yet developed, the production is not effective as it should be(Figure2).This graph is shown that the power production of geothermal energy in the past is very low because of two main reasons that mentioned earlier. Geothermal was rarely used in the past when we compared with other renewable sources. Thus, the cost and the technology can directly affect to the role of geothermal.