Antares
Updated: August 31, 2026
Founders: Jordan Bramble, Julia DeWahl
Country: USA | Funding: $596M (+)
Founded: 2023
Website: https://antaresindustries.com/
Antares designs and builds microfission reactors for strategic energy applications, including space missions, commercial and military energy resilience. Its R1 microreactor can produce from 100 kilowatts to 1 megawatt and uses TRISO fuel, which consists of uranium spheres coated with carbon and ceramics, embedded in graphite. It's designed to run safely and autonomously for 6+ years without refueling. The company performs high-precision machining of the nuclear graphite in-house, speeding design iterations. The optimized reactor design simplifies deployment with a minimal number of actuators. The control drums, made of graphite and boron carbide, have independent actuators, inspired by the designs of historical space reactors. Antares has a manufacturing facility in California and has already tested the first electrically heated demonstration unit (EDU).
Founded: 2023
Website: https://antaresindustries.com/
Antares designs and builds microfission reactors for strategic energy applications, including space missions, commercial and military energy resilience. Its R1 microreactor can produce from 100 kilowatts to 1 megawatt and uses TRISO fuel, which consists of uranium spheres coated with carbon and ceramics, embedded in graphite. It's designed to run safely and autonomously for 6+ years without refueling. The company performs high-precision machining of the nuclear graphite in-house, speeding design iterations. The optimized reactor design simplifies deployment with a minimal number of actuators. The control drums, made of graphite and boron carbide, have independent actuators, inspired by the designs of historical space reactors. Antares has a manufacturing facility in California and has already tested the first electrically heated demonstration unit (EDU).
