400C Energy

400C Energy is a US-based geothermal energy company developing enhanced geothermal systems (EGS). The company received an early grant from Stanford University's TomKat Center for Sustainable Energy — a selective program supporting novel clean energy research from Stanford-affiliated teams — indicating academic roots in Stanford's geothermal engineering community. The company's name references 400 degrees Celsius, a temperature associated with superhot and supercritical geothermal resources that could dramatically increase energy output per well compared to conventional geothermal. Specific founding date, founder details, and company headquarters are not publicly available as of early 2026.

400C Energy was established to develop geothermal technology targeting the high-temperature frontier of the EGS sector. The TomKat Center's support is consistent with companies developing early-stage technology with Stanford University connections, as the center specifically supports energy startups where academic research is being translated toward commercial application. The company's focus on high-temperature resources is aligned with the DOE's Enhanced Geothermal Shot initiative, which targets a 90% reduction in EGS costs by 2035 — a program that has attracted numerous early-stage companies working on breakthrough approaches.

400C Energy is an early-stage independent private company. Its early-stage funding has come primarily through the Stanford TomKat Center grant program. No publicly announced venture capital rounds have been reported as of early 2026.

As an early-stage company, 400C Energy is in the research and development phase. The company's progress and project details are not yet publicly available, but it represents the next generation of geothermal startups emerging from Stanford's deep reservoir of geothermal engineering expertise — the same academic environment that produced companies including Fervo Energy and Zanskar.