Superhot rock (SHR) has been called the “holy grail” of geothermal energy—because, in most of the world, SHR could provide competitive, zero-carbon, dispatchable power and support zero-carbon hydrogen fuel production. It is one of the very few high-energy-density, zero-carbon resources that could replace fossil energy around the globe. With significant private and public investment, SHR could plausibly be commercialized within 10-15 years. John Herter and Eric Ingersoll of Terra Praxis contributed to this important Clean Air Task Force (CATF) report.