Contents : An Overview of Resources,Understanding Geothermal Resource and Geothermal Energy,Earth Crust, Enhanced Geothermal Systems (EGS) and Their Impact on Environment, Geothermal Power Plant and Generation, Volcanoes as a Source of Geothermal Energy,Harnessing Earth's Heat: Geothermal Electricity and Fuel Cells in Energy Conversion,Geothermal Energy Systems Designed for Heating and Cooling Purposes,Geothermal Energy as a Significant Contributor to the Renewable Energy Sector, Geothermal Resource for Agriculture Sustainability.