Stellaria

French tech company | Builders Republic

About

Deeptech spun out of the French atomic energy commission CEA developing the Stellarium, a fourth-generation molten-salt nuclear reactor — a compact fast-neutron design that regenerates its own fuel, runs for years without refueling and burns down long-lived waste, delivering low-carbon heat and power for heavy industry.

Key facts

Status
Active
Sectors
Climate, Cleantech & Energy
Latest stage
Series A
Founded
2023
City
SAINT-PIERRE-LA-PALUD
Region
Auvergne-Rhône-Alpes
Tracked rounds
2
Amount raised
35 M€ raised since 2020

Funding rounds

  • Series A — 2025
  • Seed — 2024

Investors