Stellaria is developing the Stellarium, a fourth‑generation molten‑salt fast‑neutron reactor designed to fully regenerate its fuel during operation and be self‑sufficient for more than 20 years. The design aims to reduce long‑lived nuclear waste (minor actinides) and to provide competitive, safe and flexible low‑carbon power for industry and the grid. The company plans a first molten‑salt facility capable of sustaining a fission reaction by 2029 and expects a first production unit ready for commercial deployment by 2035. Funding announced in 2025 is being directed to technical and regulatory studies, the development of a liquid‑core fast‑neutron demonstrator, and R&D acceleration. Stellaria intends to double its workforce to support those efforts and to expand its Grenoble research laboratory by several million euros. The company was founded in 2023 and originates from CEA and Schneider Electric.

Total raised

$27M

Funding rounds

1

Latest round

Equity

Latest activity

Jul 2025