The history of geothermal power generation in the world has been briefly reviewed. In the past five years, considerable changes in the geothermal development have been brought. Historically high oil prices since 2005, supporting by a global ambition to address greenhouse gas reduction have impelled every country in the world paying attention to the renewable energy. Geothermal developments have accelerated in many parts of the world, either in the countries, such as New Zealand, Indonesia, and the USA having a traditional interest in conventional geothermal resources, or in the countries having no historical interest in geothermal energy, such as Australia and Germany. The analysis conducted indicates that some new developments have followed well-worn paths using conventional hydrothermal resources in volcanic regions, while others have struck out in new directions involving Enhanced Geothermal System (EGS) projects in non-volcanic regions. Technology advance has allowed to developing conventional resources with lower temperature, restricted water access, and constrained surface utilization. EGS projects have launched in a variety of different directions and places, currently the USA keeps six EGS projects in operation. Based on current status, the future for the operation expansion of geothermal developments depends on new fields exploration and technical challenges overcoming in known but not-yet-exploited fields. Two issues are currently being addressed by the world geothermal community, they are (1) the productivity gap in the exploitation of fields, namely, temperature is too high for down-hole pumps, however it is too low for flash production; (2) the reliable EGS development procedures are able to ensure sustainable flow rates and assure the public that seismologic disasters will not be induced.