This book provides comprehensive insights into the field of geothermal energy engineering. It explores all the important aspects of this field in the present day scenario. Geothermal energy is one of the most important forms of alternative energy present today. It is generated within earth's crust because of radioactive decay of materials and is stored in the same. It is the most reliable, cost-effective and environmental friendly power. This text will give detailed analysis about the use and extraction of geothermal energy. It will also discuss the engineering methods required for its exploration. Different approaches, evaluations, methodologies and advanced studies in this area have been included in the text. Students, researchers, experts and all associated with the field of geothermal energy engineering will benefit alike from this text.