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‘World’s first’ molten salt nuclear reactor to enter commercial operation by 2035

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Open-access content Tanya Weaver

Tue 22 Jul 2025

The world’s first fast neutron nuclear reactor is a step closer to reality following a €23m funding round.

French start-up Stellaria has announced it has raised a further €23m to build a new kind of nuclear reactor called Stellarium in Grenoble, France.

This brings the company’s total funding to €33m, including €10m through the France 2030 program.

Founded in 2023 as a spin-off from the French nuclear research commission CEA and energy management company Schneider Electric, Stellaria has been raising investment to build the Stellarium fast neutron molten salt reactor. 

This fourth-generation reactor will be capable of operating in a closed fuel cycle using molten salt technology and nuclear isogeneration. 

It has a target capacity of 110MWe (110 megawatts of usable electric power) – enough to power roughly 250,000 homes or supply a large industrial site annually.

The reactor is designed to operate for over 20 years without refuelling. It will also significantly reduce long-lived nuclear waste by incinerating it during operation.

The energy generated by the facility will help decarbonise energy-intensive industries such as data centres, heavy manufacturing, mining operations and chemical plants, as well as remote sites that require reliable, carbon-free baseload power.

The company plans to achieve its first nuclear reaction in 2029, with industrial commercialisation expected by 2035.

This latest funding will go towards financing the technical and regulatory studies required to establish the facility. This will involve developing a research laboratory in Grenoble and doubling its workforce to work at the R&D facility to help develop its Stellarium demonstrator.

Nicolas Breyton, CEO of Stellaria, said: “This funding round demonstrates the confidence of investors in the technical maturity of our molten-salt reactor, which opens up a new path towards the circular economy of the fuel cycle.

“We are laying the foundations for a model in which electro-intensive industries become self-sufficient in energy throughout the lifetime of their facilities. This is a key step towards the sustainable reindustrialisation of our territory.”

Frédéric Godemel, executive vice-president energy management at Schneider Electric, said: “Stellaria is on track to develop the world’s first fast neutron molten-salt nuclear reactor by 2035. This project will offer affordable and impactful solutions for industrial decarbonisation, a tangible sign of the progress being made in the industry.

“Innovations like these show what can be achieved with bold ideas and strong partnerships.”

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