1
Country: USA | Funding: $1.7B
X-energy produces the Xe-100 - small modular nuclear reactor. It is a fourth-generation, 80-megawatt high-temperature gas-cooled reactor (HTGR), boasting (according to the company) 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. The company also aims to produce power systems for lunar bases.
X-energy produces the Xe-100 - small modular nuclear reactor. It is a fourth-generation, 80-megawatt high-temperature gas-cooled reactor (HTGR), boasting (according to the company) 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. The company also aims to produce power systems for lunar bases.
2
Country: USA | Funding: $1.8M
Valar Atomics develops small modular nuclear reactors using proven high-temperature gas reactor (HTGR) technology combined with safe TRISO fuel. HTGRs are optimized to produce high-quality process heat which is used for industrial and chemical applications, providing nearby partners with affordable, abundant and clean energy. Using TRISO-coated fuel particles and helium coolant, the HTGRs passively remove decay heat without active systems or operator intervention. This design minimizes the risk of core damage even in severe accident scenarios. The company plans to mass-produce the reactors and deploy them at so-called gigasites, where they will power AI data centers, industrial facilities, and other customers.
Valar Atomics develops small modular nuclear reactors using proven high-temperature gas reactor (HTGR) technology combined with safe TRISO fuel. HTGRs are optimized to produce high-quality process heat which is used for industrial and chemical applications, providing nearby partners with affordable, abundant and clean energy. Using TRISO-coated fuel particles and helium coolant, the HTGRs passively remove decay heat without active systems or operator intervention. This design minimizes the risk of core damage even in severe accident scenarios. The company plans to mass-produce the reactors and deploy them at so-called gigasites, where they will power AI data centers, industrial facilities, and other customers.
3
Country: France | Funding: €15M
Jimmy designs and operates nuclear-reactor-based thermal generators to produce and supply industrial clients with decarbonized process heat at a lower cost than fossil fuels, with a secured price over 20 years. It's nuclear reactor with no turbine, no generator and no grid connection is a 131-foot box running helium at 1,382 degrees and TRISO fuel
Jimmy designs and operates nuclear-reactor-based thermal generators to produce and supply industrial clients with decarbonized process heat at a lower cost than fossil fuels, with a secured price over 20 years. It's nuclear reactor with no turbine, no generator and no grid connection is a 131-foot box running helium at 1,382 degrees and TRISO fuel
4
Country: USA
ZettaJoule is developing high-temperature gas-cooled reactor ZJ designed to operate at temperatures up to 950 °C. Its advanced SMR technology builds on decades of proven, safety-tested operations at the High Temperature Engineering Test Reactor in Japan, which has operated since 1998. The startup is modernizing its design to maximize efficiency, lower costs, and power a wide range of applications. Its design leverages artificial intelligence and AI-based digital twins to streamline operations, cut costs, accelerate delivery, and minimize human error.
ZettaJoule is developing high-temperature gas-cooled reactor ZJ designed to operate at temperatures up to 950 °C. Its advanced SMR technology builds on decades of proven, safety-tested operations at the High Temperature Engineering Test Reactor in Japan, which has operated since 1998. The startup is modernizing its design to maximize efficiency, lower costs, and power a wide range of applications. Its design leverages artificial intelligence and AI-based digital twins to streamline operations, cut costs, accelerate delivery, and minimize human error.
