Indonesia as one of the countries that has a very large geothermal potential. Its utilization should be developed because this energy is classified as renewable and sustainable energy. Indonesia has geothermal potential of 28,910 MW, as the second largest country in the world. So far only 1,699 MW of installed capacity or 5.9% of its geothermal potential. The purpose of this study is to describe how the process of building a sustainable geothermal power plant on the slopes of Slamet Mount has not been successful. The study method used is qualitative with interview, observation and documentation techniques in data collection. The data analysis method uses interactive analysis. The results of the study show that the construction process of geothermal power plants on Slamet Mount has actually started since 2005. The initial plan was that in 2021 it could be exploited with 220 megawatts of electricity. In fact, it's not finished yet. One of these constraints is caused by environmental factors which include abiotic, biotic and social components. Abiotic components in the form of geological aspects and extreme land conditions that cause water pollution. The biotic component is the fishery and agriculture sectors of the population affected by the turbidity of the water. The social component is public unrest, resulting in demonstrations against the development process of sustainable geothermal power plant.
Keywords: Geothermal; Sustainable energy; Environmental constraints; Slamet mount.