In this master's thesis, three different aspects of geothermal energy are presented. Digging, electricity generation, and policies of geothermal-rich countries. First, a general geological overview of the world is presented, followed by information on geothermal drilling techniques and available technology. It explains the basic elements of digging, such as drilling rigs, types of drilling bits, and types and performances of drilling pipes. It later explained the impacts of geothermal energy on the energy policies of states, i.e., the use of electricity as a diplomatic tool and as a substitute for fossil fuels; electricity production; as well as more sophisticated binary cycle variants and EGS systems. Here, a new geopolitical picture is presented, along with new international partnerships between geothermal-rich nations. Later, the inter-state relations related to geothermal energy were described to finally give the total world capacity of geothermal energy and the policies of the states towards it.