Jordan Bramble

Antares Nuclear's Mark-0 microreactor achieved criticality at Idaho National Laboratory under the U.S. Department of Energy's Reactor Pilot Program, established via President Trump's 2025 executive order. This marks the first advanced reactor to reach criticality under the program and the first privately developed non-light-water reactor in the U.S. in over four decades.

The U.S. Energy Department announced that Antares Nuclear Inc.'s microreactor at Idaho National Lab achieved criticality, a milestone under the Trump administration's nuclear energy initiative. The reactor, expected to produce electricity by late 2027, marks the first by a private company in the program.

The U.S. Energy Department announced that a microreactor developed by Antares Nuclear Inc. at Idaho National Lab achieved criticality, a key milestone for producing electricity. This marks the first time a private company under a Trump administration pilot program has reached this stage, with plans for commercial deployment by 2028.