Federal program
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Met its three-reactor criticality goal ahead of schedule and expanded into a longer-running Nuclear Energy Launch Pad program
On June 4, 2026, Antares Nuclear's Mark-0 reactor at an Idaho desert lab started a self-sustaining nuclear reaction. It was the first privately built non-light-water reactor to do that in the U.S. in more than 40 years, and four rival startups matched the feat within nine weeks.
Updated Aug 8
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