Clean Energy companies

Critical Energy Systems designs and builds factory-made, modular power plants that convert geothermal and waste heat into grid-scale electricity using custom tu…

Kairos Power is a U.S. nuclear energy company developing fluoride salt-cooled high-temperature reactors using TRISO fuel, with demonstration reactors under cons…

Commonwealth Fusion Systems develops compact tokamak fusion power plants using high-temperature superconducting magnets to generate clean energy.

Oklo is a public nuclear energy company developing advanced fast fission power plants and nuclear waste recycling technology.

Zap Energy is developing compact fission and fusion power systems using sheared-flow-stabilized Z-pinch technology to deliver carbon-free energy.

Type One Energy is a fusion energy startup developing and commercializing stellarator-based power plants, including a project for the first grid-scale commercia…

Radiant Nuclear is developing mass-produced portable nuclear microreactors to replace diesel generators for remote and critical infrastructure.

Xcimer Energy is an inertial fusion company developing excimer-based laser fusion technology to commercialize safe, affordable, and carbon-free fusion energy.

Helion develops pulsed magneto-inertial fusion technology to build commercial fusion power plants for clean electricity generation.

Valar Atomics is a nuclear energy startup building standardized high-temperature gas reactors on gigasites for industrial power, hydrogen, and clean fuels, and…

Panthalassa is a public-benefit corporation building autonomous ocean-based platforms that generate terawatt-scale clean energy from open-ocean waves, combining…

Atomarine designs and manufactures floating data center platforms cooled by seawater and powered by nuclear ships, enabling rapid, location-agnostic deployment…

General Matter is a U.S. nuclear-fuel startup focused on domestic uranium enrichment to produce LEU and HALEU for reactors, supporting American energy independe…