Copenhagen Atomics
Updated: August 18, 2026
The team
Country: Denmark | Funding: $33.6M (+)
Founded: 2014
Website: https://www.copenhagenatomics.com/
Copenhagen Atomics is developing thorium molten salt reactor technology, with a focus on low electricity prices and fast installation. Its first test reactor (planned for 2028) and first commercial reactors (planned for 2030s) will run on 5% enriched uranium as fuel salt and thorium as blanket salt. With high enriched Li7 for optimal neutron economy, CAs reactors will have better neutron economy than any other reactor ever designed or build (according to the startup). The first reactors will not be breeder reactors, meaning that they will generate more fissile fuel than they consume. But they will have breeding ratio approaching 1. In the long term CA wishes to make thorium breeder reactors in the thermal spectrum (slow neutrons). CA has also invented the Onion Core technology, enabling a compact reactor that can be mass-manufactured efficiently while requiring only a small amount of materials.
Founded: 2014
Website: https://www.copenhagenatomics.com/
Copenhagen Atomics is developing thorium molten salt reactor technology, with a focus on low electricity prices and fast installation. Its first test reactor (planned for 2028) and first commercial reactors (planned for 2030s) will run on 5% enriched uranium as fuel salt and thorium as blanket salt. With high enriched Li7 for optimal neutron economy, CAs reactors will have better neutron economy than any other reactor ever designed or build (according to the startup). The first reactors will not be breeder reactors, meaning that they will generate more fissile fuel than they consume. But they will have breeding ratio approaching 1. In the long term CA wishes to make thorium breeder reactors in the thermal spectrum (slow neutrons). CA has also invented the Onion Core technology, enabling a compact reactor that can be mass-manufactured efficiently while requiring only a small amount of materials.
