A 500-megawatt geothermal plant in Utah is marketed as power that works anywhere, day or night, and the underground catch that every utility signing a contract is now being asked to manage

The site is Cape Station, in Beaver County, Utah. That matters enormously because conventional geothermal power needs naturally occurring steam or hot water near the surface, which largely limits it to places like Yellowstone country. In EGS, water moves through fractures deep underground, absorbing heat that is converted to electricity. The commercial viability of large-scale EGS remains a work in progress, with Cape Station positioned to become the first project to cross that threshold. Historical seismic records for the Cape Station area give the company a benchmark to characterize real-time data and evaluate on-site subsurface risks before the first watt is delivered.