Companies

Commonwealth Fusion Systems is developing tokamak fusion power plants built around high-temperature superconducting magnets. The company is assembling its SPARC demonstration machine in Devens, Massachusetts.

General Matter is designing, building and operating uranium enrichment services in the United States.

Radiant is an El Segundo, California startup building mass-produced, portable nuclear microreactors. Its first reactor, Kaleidos, is a 1-megawatt unit designed to be transported where power is needed.

Valar Atomics is developing factory-made, high-temperature nuclear power for industry, with a pilot plant planned in Utah.

TerraPower is a nuclear innovation company in Bellevue, Washington, developing the Natrium sodium-cooled fast reactor and medical isotope production.

Antares is building mass-producible, deployable microreactors for terrestrial, underwater and space applications.

Oklo is developing compact fast-reactor powerhouses and fuel recycling technology, aiming to sell power directly to customers.

Helion is a fusion power company based in Everett, Washington, developing pulsed magneto-inertial fusion systems intended to generate electricity directly.

The Nuclear Company is focused on developing and delivering a fleet of new large-scale nuclear power plants in the United States.

Xcimer Energy is pursuing inertial fusion energy using a new excimer laser architecture, with the goal of deploying fusion power plants.

Proxima Fusion is a European fusion company developing stellarator power plants. It was spun out of the Max Planck Institute for Plasma Physics (IPP).

Kairos Power is developing a fluoride salt-cooled, high-temperature reactor and is building its Hermes demonstration reactor in Oak Ridge, Tennessee.

Fuse develops pulsed-power technology with the stated mission of accelerating the transition to fusion energy.

Last Energy develops small, modular pressurized water reactor power plants intended for industrial and data-center customers.

Pacific Fusion, founded in 2023, is designing and building a pulser-driven inertial fusion system aimed at net facility gain, alongside the components needed for affordable fusion power.

Standard Nuclear manufactures nuclear fuel and other core building blocks for advanced reactors.

Forge Atomics is developing technology to rapidly scale the deployment of nuclear fission.

Marvel Fusion, founded in 2019, is a laser-driven fusion energy company with teams in Munich and Colorado.

Blue Energy aims to build nuclear plants in shipyard-style factories rather than constructing each plant on site from scratch.

Nusano is a physics company commercializing radioisotope production, stable isotope enrichment and advanced separation technologies.

Applied Atomics designs, builds and operates nuclear plants alongside the facilities they power, using proven reactor technology.

Inertia is commercializing laser-driven inertial fusion, building on the ignition approach pioneered at Lawrence Livermore National Laboratory.

Deep Fission is developing pressurized water reactors placed deep in boreholes, using the surrounding earth for containment.

Hexium is modernizing atomic vapor laser isotope separation (AVLIS) into a scalable industrial technology for domestic isotope production.

Tokamak Energy is a UK company developing spherical tokamak fusion and high-temperature superconducting magnet technology.