X-energy
Updated: November 25, 2025
Founder Kam Ghaffarian
Country: USA | Funding: $1.7B (+)
Founded: 2009
Website: https://x-energy.com/
X-energy produces the Xe-100 - small modular nuclear reactor. It is a fourth-generation, 80-megawatt high-temperature gas-cooled reactor (HTGR), boasting high stability, efficiency, reliability and safety. The reactor can be scaled into 4-pack power plant thanks to its modular design. Its construction maximizes the use of off-the-shelf components, that can be delivered to the site using existing road and rail routes. The reactor does not rely on any active systems, electrical power or human intervention for safety, i.e. it shuts down and dissipates heat passively (as a result of the low power density). X-energy also produces TRISO-X fuel, which can withstand extreme temperatures. X-energy also aims to produce power systems for lunar bases.
Founded: 2009
Website: https://x-energy.com/
X-energy produces the Xe-100 - small modular nuclear reactor. It is a fourth-generation, 80-megawatt high-temperature gas-cooled reactor (HTGR), boasting high stability, efficiency, reliability and safety. The reactor can be scaled into 4-pack power plant thanks to its modular design. Its construction maximizes the use of off-the-shelf components, that can be delivered to the site using existing road and rail routes. The reactor does not rely on any active systems, electrical power or human intervention for safety, i.e. it shuts down and dissipates heat passively (as a result of the low power density). X-energy also produces TRISO-X fuel, which can withstand extreme temperatures. X-energy also aims to produce power systems for lunar bases.
