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Stellaria Designa develops a liquid-core nuclear reactor designed to use renewable fuels.
Stellaria Designa develops the Stellarium, a liquid-core nuclear reactor designed to operate on renewable fuels and renew its fuel during operation. The company is based in Grenoble, France, and was founded in 2023. In July 2025, it raised EUR 23 million co-led by At One Ventures and Supernova Invest, with CEA Investissement, Schneider Electric, Exergon, and Technip Energies N.V. participating. The funding supports development of its fast neutron molten salt reactor, with completion targeted by 2035.
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