# Stellaria Designa

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/stellaria-designa

- Industry: Renewable Energy
- Headquarters: Grenoble, France
- Website: www.stellaria.fr/
- Total disclosed funding: $29M
- Latest round: Seed (Jul 17, 2025)
- Investors on record: 7

## About

Based in France, Stellaria Designa specializes in sustainable energy solutions, focusing on innovative nuclear reactor technology that utilizes renewable fuels for efficient energy generation.Stellaria Designa, founded in 2023 in Grenoble, France, develops advanced nuclear reactors. The company has successfully completed 2 deals, with its most recent funding round occurring on July 24, 2025, raising EUR 23 million. The funding was co-led by At One Ventures and Supernova Invest, and included returning investors such as CEA Investissement, Schneider Electric, Exergon, and Technip Energies N.V. The founder's background is not specified, and there are no known subsidiaries or parent companies.Stellaria's core offering is the Stellarium, an advanced nuclear reactor designed to operate on renewable fuels, specifically utilizing liquid core technology. This reactor renews 100% of its fuel during operation, addressing high-level long-lived waste by incinerating a portion of it. The Stellarium aims to provide sustainable energy solutions that can compete with traditional fossil fuel power plants, reducing carbon emissions by 99% per megawatt-hour generated. Targeted end users include industrial sectors such as petrochemicals, mining, and data centers, primarily in Europe, focusing on countries actively pursuing renewable energy initiatives.Stellaria's revenue model is structured around direct sales and potential partnerships with industrial clients seeking innovative energy solutions. Transactions typically involve long-term agreements where clients commit to utilizing the Stellarium for their energy needs, ensuring a stable revenue stream for the company. While specific pricing plans for the Stellarium are not disclosed, the transaction structure may involve fixed costs associated with the installation and operation of the reactors, tailored to meet the energy demands of each client.In July 2025, Stellaria Designa raised EUR 23 million in venture funding to support the development of its fast neutron molten salt reactor, targeting completion by 2035. The company plans to expand into new markets, particularly within Europe, to align with the increasing demand for renewable energy solutions. The recent funding will facilitate advancements in their technology and enable broader market outreach.

## Funding rounds

- Seed, Jul 17, 2025, $27M — CEA Investissement, Schneider Electric, Supernova Invest, At One Ventures, Technip Energies N.V., Exergon
- Seed, Dec 29, 2023, $1.9M — CEA Investissement, Schneider Electric, Audacia, Supernova Invest

## Investors

- CEA Investissement (https://capitalatlas.ai/funds/cea-investissement) — Seed
- Schneider Electric — Seed
- Audacia (https://capitalatlas.ai/funds/audacia) — Seed
- Supernova Invest (https://capitalatlas.ai/funds/supernova-invest) — Seed
- At One Ventures (https://capitalatlas.ai/funds/at-one-ventures) — Seed
- Technip Energies N.V. — Seed
- Exergon (https://capitalatlas.ai/funds/exergon) — Seed