Fervo Energy is a leader in enhanced geothermal systems, harvesting 400°F+ heat from hot, deep rock formations, as fluids flow from fracced horizontal injectors to fracced horizontal producers. This Fervo Energy technology review is based on reviewing a dozen patent families. Fervo draws on fiber optic sensing data to optimize the well completion process and maximize heat rates.
Fervo Energy was founded in 2017, is headquartered in Houston, has ramped to 225 employees, completed a $462M Series E round in December-2025, bringing total capital raised to $1.5bn, from an amazing array of partners and investors. The company has now also submitted an S-1 for an IPO.
Fervo is a leader in Enhanced Geothermal Systems (EGS), where fluids are injected into fracced horizontal wells; passing through hot, fractured rocks at 8,000-11,000 ft depths; into fracced horizontal producer wells, which might be situated c200-500ft above/beside the injectors.
Fervo is deploying this concept in areas with 3-4x higher geothermal gradients than the global average, in order to access 400°F reservoir temperatures, which can likely unlock 20-25% electrical efficiency in an Organic Rankine Cycle for power generation, as covered in our geothermal cost/project tracker.
This data-file is a Fervo Energy technology overview, based on reviewing a dozen of the company’s patent families. We were amazed at the nature, quality and detail in these patent disclosures.
Only partly about drilling? We had expected Fervo’s patents to focus mainly on reducing drilling costs, in igneous rocks, which have 2x higher compressive strength than the sedimentary rocks found in oil and gas wells. This was a focus in two patents.
The key focus, in our Fervo Energy technology review, however, was in maximizing the amount of heat that can be extracted from hot and deep rocks, by pairs of injector-producer wells. This requires achieving uniform hydraulic fracturing, across stages, clusters and perforations, in turn helped by using models and data, especially fiber optic sensing (chart below).
Full details on the patents are available in the data-file, including excellent, specific details. It is worth reading our conclusion on the ‘Conclusions’ tab. But the breadth and depth of this patent library should also make it worthwhile to read our summaries of each individual patent family, in the ‘Patents’ tab, to understand the specific technologies that Fervo has developed.