Geothermal energy is a renewable energy resource with low environmental impact. The course will develop the following topics: Origin of terrestrial heat. Geothermal anomalies and geodynamics. Relationships between volcanism and geothermal sources. Other sources of thermal anomalies in the crust, magmatic chambers in volcanic areas, intrusions, relaxing areas (rift, etc.). The cooling of magmatic bodies by conduction and convection and geothermal anomalies. The hydrothermal systems in volcanic areas, connected systems to intrusion, systems connected to relaxing areas. The hydrothermal fluids. Water and gas. chemical and physical properties. The minerals of hydrothermal alteration. The water-rock interaction processes, general. Mineral zonation of hydrothermal systems. Examples of hydrothermal systems in industrial exploitation. Geothermal fields, types, characteristics and their classification. The utilization of geothermal fields. Power production and direct uses. Geothermal exploration: geological, geochemical and geophysical methodologies. Geothermal drilling. Development of conceptual models. Sustainable use of geothermal fields. Field work in Italian geothermal fields.