Potential of geothermal energy for electricity generation in Indonesia: A review

Geothermal energy is counted as a type of renewable energy, which means the availability is not affected by the lack of source and the increasing price of fossil oil. Environmental friendly is also one of the advantages of geothermal energy. In general, not all countries have the potential of geothermal energy, only countries traversed by the ring of fire have the geothermal energy resource. As one of the countries that traversed by the world׳s ring of fire, Indonesia hence holds the geothermal potential, which is indicated by the existing 117 active volcanoes spread across the country. Indonesia׳s geothermal energy potential is estimated about 40% of the world׳s geothermal energy potential or about 28,617 MW. However, only about 4.5% is being utilized as electrical energy in the country. The government of Indonesia is continuously putting the effort to increase the capacity of geothermal power plant. It is planned to install more geothermal power plant in Indonesia that amounted up to 9500 MW by 2025.