According to Just The News, Antares Nuclear announced that its Mark-0 microreactor, operating under DOE authorization, has reached initial criticality, the stage at which a reactor sustains a continuous nuclear chain reaction. This achievement makes Antares the first private company to hit that benchmark under the DOE’s Reactor Pilot Program.
The pilot program was created by President Trump’s 2025 executive order, which directed federal agencies to accelerate the deployment of advanced nuclear technologies as part of a broader pro-growth, pro-energy agenda. For conservatives who have long argued that burdensome regulation has strangled American energy potential, the Antares milestone offers fresh evidence that streamlined policy and private-sector ingenuity can deliver results.
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Antares said the successful criticality test confirmed key reactor physics parameters and generated data that will inform the design and licensing of future reactors. The company’s Mark-0, a non-light water microreactor, is intended to provide flexible, reliable power in a compact footprint, potentially reducing dependence on foreign energy and large, centralized grids.
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“By bringing the first American non-light water privately developed reactor to criticality in more than four decades, Antares has shown what is possible when American innovation is unleashed. The Trump administration is proud to support the rebirth of America’s nuclear industry and ensuring Americans have access to affordable, reliable and secure energy for generations to come," Energy Secretary Chris Wright said in a statement. As policymakers debate the nation’s energy future, the Antares breakthrough will likely bolster arguments for expanding nuclear power as a clean, dependable alternative to the costly and intermittent green mandates favored by the left.






