The heat of the Earth’s interior is one of the main renewable energy resources, of which a strong development is expected as an instrument of international policies aimed at reducing greenhouse gas emissions. The course is designed to provide students with the elements for understanding the fundamental characteristics of high, medium and low enthalpy geothermal systems, and of the main exploration methods for which the geologist is the main professional figure. As part of the course students will progressively acquire the ability to reconstruct a conceptual model of geothermal system starting from geological, geophysical and geochemical data, which will define the main extensive and intensive properties of heat sources, geothermal reservoirs and cap rocks. The fundamentals of geospatial and numerical modeling applied to geothermal prospecting will also be addressed. Students will be stimulated to analyze the problems and propose the relative solutions.