Superhot Rock Geothermal Energy

Superhot rock geothermal energy is an emerging approach to geothermal power that targets dry, low permeability rock at extreme depth and temperature, generally above 400 degrees Celsius, rather than the shallower hydrothermal reservoirs conventional geothermal plants rely on. The concept works like other geothermal systems in principle: water pumped down one well travels through the hot rock, returns through a second well already turned to steam, drives a turbine to generate electricity, and is cooled and reinjected to keep the cycle going, but reaching superhot rock requires drilling far deeper and through far hotter formations than most conventional drilling can manage affordably. IEA Geothermal, the International Energy Agency own geothermal technology collaboration programme, formed an international task group on superhot rock in 2025 to coordinate projects already under development in New Zealand, Iceland, Japan, Norway and Italy, describing the resource as a promising, low carbon, always on energy source that could in principle be developed almost anywhere, with the group near term goal being a credible pathway to commercial viability rather than a proven mature technology.