Two years ago, in June 2023, Stellaria was born. Carried by a small group of committed people, the start-up we know today was just beginning its journey to design a next-generation, innovative nuclear reactor.
Since then, we’ve reached several crucial milestones in the company’s development, while staying true to the same mission: to support the energy transition and the European energy mix with safer, more sustainable nuclear power.
More than sustainable, we’re now committed to promoting a form of innovative nuclear energy that can truly be called renewable: the Stellarium will finally make it possible to close the fuel cycle.
Our technological commitment: molten salt reactors
In just two years, we’ve established ourselves as a key player in the European molten salt reactor market. Although this sector is still emerging in our regions, it is nonetheless strategic for achieving carbon neutrality. In this context, the Stellarium positions itself as a game changer, delivering on the long-awaited promise of closing the nuclear fuel cycle .
Today, we’re actively developing our prototype through ambitious research partnerships with organizations such as the CEA and CNRS, high-quality industrial collaborations (including Technip Energies), and strong institutional support. These joint efforts give us access to vital resources and expertise for our growth.
A sustained growth momentum
Since June 2023, we have:
- levé des fonds auprès d’acteurs reconnus de l’investissement deeptech et climat pour raised €1.75 million from leading deeptech and climate investors (with a second round imminent — expected to be 10 times bigger!)
- finalized three preliminary designs: for our fission experiment, Alvin, our prototype, MegAlvin, and the first production unit of our reactor, the Stellarium
- presented the Stellarium at international exhibitions such as WNE, Viva Technology, and Tech&Fest
- joined acceleration programs and earned recognition in several competitions dedicated to the energy transition (for example, we were named among the year’s top 30 innovations by Vivatech in partnership with leading startup media TechCrunch) ;
- invested in cutting-edge technologies to simulate Stellarium’s operating scenarios under extreme conditions and ensure its resilience
- built a strong ecosystem of academic and industrial partners to test molten salts and design both our first demonstrator and our fission experiment.
Our ambition: paving the way for low-carbon, accessible, renewable nuclear energy
To bring renewable nuclear energy to life as soon as possible, several milestones still lie ahead.
The next step is to launch our first experimental campaigns in the lab, accelerating R&D around the Stellarium, the prototype, and our critical experiment. In the short term, this will prove that innovative nuclear is no utopia — but rather an agile, indispensable tool to help decarbonize industries and secure our energy supply..
At the same time, we’ll continue expanding across Europe and beyond, signing new strategic collaborations with international experts. In addition to strengthening our team, this is a crucial lever for tackling global energy challenges while enabling our regions to regain sovereignty. We've always been determined to play an active role in this movement!
To all of you: Thank you!
Your support and commitment are essential to advancing our vision of an innovative, competitive, controllable, and sustainable nuclear future. This achievement is, above all, a collective one. Thank you to our teams, aux , to the researchers and engineers working alongside us, to our partners,to our investors , and to everyone who believes in the importance of diversifying low-carbon solutions.
Happy anniversary!