Antares
Mass-manufactured nuclear microreactors for Earth, sea, and space.
The product
The R1 fission microreactor — a factory-produced, transportable 100 kWe to 1 MWe reactor with a 6+ year core life, built around TRISO fuel pellets, sodium heat pipes, and a closed nitrogen Brayton power conversion cycle. Antares is standing up Antares Prime, a 145,000 sq-ft vertically integrated R&D and manufacturing facility in Southern California, with the goal of producing ten reactors per year.
The thesis
Antares is one of eleven companies selected for the DOE Reactor Pilot Program with a mandate to demonstrate a working reactor by July 4, 2026, and is the first company to receive an approved Nuclear Safety Design Agreement (NSDA). A US-built, deployable microreactor unlocks resilient power for forward operating bases, remote industrial sites, naval applications, and lunar/orbital missions — and reestablishes domestic capacity to actually mass-produce reactors, the literal core of any reindustrialization thesis.
How it runs
Vertically integrated developer and manufacturer of modular, transportable fission microreactors. Antares combines reactor design with in-house graphite machining, heat-pipe and thermal-management work, controls, testing, and manufacturing at its 322,000-square-foot Antares Prime facility.
How it earns
Commercial model centers on manufacturing and deploying R1 reactor systems for government and other strategic-energy customers; federal awards and demonstration programs support development. Public pricing has not been disclosed.
Why it wins
The R1 is designed around passive sodium heat pipes, TRISO fuel, a low-pressure nitrogen Brayton cycle, integrated shielding, and a vertically integrated supply chain intended to shorten iteration cycles and improve manufacturability and reliability.
Evidence ledger
- website · 2026-04-28
Antares identifies as a reindustrialization company.
https://antaresindustries.com - web · 2026-09-17
Antares and Centrus signed a definitive multi-year contract for U.S.-origin HALEU, with deliveries beginning before the end of the decade. Antares says the fuel will support reactor deployments for defense and space customers. Antares identifies current selections from the Army, Air Force, and Space Force.
https://antaresindustries.com/updates/centrus-haleu - web · 2026-07-27
Antares raised a $470 million Series C comprising $370 million in equity and $100 million in debt. The financing supports a Mark-1 electricity-producing reactor in 2027 and initial defense deployments in 2028.
https://antaresindustries.com/updates/antares-raises-seriesc - web · 2026-09-28
Antares says Antares Prime is 322,000 square feet of vertically integrated R&D space. The current roadmap targets final design and subsystem qualification in 2026, electricity production in 2027, and customer deployments beginning in 2028. The R1 is specified at 100 kWe to 1 MWe for more than six years and uses TRISO fuel, sodium heat pipes, and a closed nitrogen Brayton cycle.
https://antaresindustries.com/
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