French startup Stellaria has raised €23m ($26m) to develop its fast neutron molten salt nuclear reactor by 2035.

The new round of funding comes two years after a successful first round in 2023.

The round was co-led by US impact fund At One Ventures and Supernova Invest, alongside Stellaria’s historical investors, including CEA Investissements, Schneider Electric, Exergon, and Technip Energies.

Stellaria, which was founded by the French Alternative Energies and Atomic Energy Commission (CEA) and France-based technology company Schneider Electric, said the funding will be used to finance all the technical and regulatory studies necessary to establish a first molten-salt facility capable of sustaining a fission reaction, scheduled for 2029.