Geothermal power from hot dry rock (HDR) is a type of geothermal energy that involves using technology to extract heat from hot rock deep beneath the Earth's surface. This is done by drilling deep wells and injecting water into the rock, which then returns to the surface as steam or hot water that can be used to generate electricity. HDR has the potential to be a significant source of renewable energy, as it can be found in many locations around the world.