Antares NuclearIn Development
Antares' commercial factory-built microreactor: a TRISO-fueled prismatic graphite core with graphite and boron carbide control drums, passive sodium heat pipes, a fin-and-tube primary heat exchanger, and a recuperated nitrogen closed Brayton cycle at under 300 psi. Packaged with integrated shielding and a transport cradle for defense-critical assets, rated at 100 kWe to 1 MWe for 6+ years without refueling and without a grid connection.
Latest update Sep 18, 2026
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Physics of the core were validated by Mark-0's June 4, 2026 zero-power criticality. The first electricity-producing article is the Mark-1, targeted for 2027 at INL using the same facility and HALEU TRISO batch. Initial production deployments to defense customers are targeted for 2028, including Joint Base San Antonio under ANPI and Fort Bragg under Janus.
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A full-scale, zero-power demonstration of the R1 core at Idaho National Laboratory's RACE facility, built under DOE's Reactor Pilot Program. It has no power conversion or heat-removal loop; the test validated reactor physics, control-drum behavior, and the DOE authorization pathway using BWXT-fabricated HALEU TRISO.
Space variant of the R1 heat-pipe microreactor. Under a $161M Space Force Strategic Breakthrough award, Antares will run a nuclear ground demonstration of the R1-S, integrate it with a spacecraft for flight certification, and use Mark-1 to power an operational ground-to-space asset during 2027 testing.
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NuScale Power
Full-scale SMR power plant with 12 modules generating up to 924 MWe of carbon-free electricity.
NuScale Power
Self-contained 77 MWe pressurized water reactor module with integrated steam generators.
NuScale Power
Mid-size SMR plant configuration with 6 modules producing up to 462 MWe.
Oklo
Oklo's fast-fission powerhouse product line is designed for build-own-operate deployment, targeting customers that want firm clean power in a smaller footprint than traditional large reactors.