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America's First Small Modular Nuclear Reactor Just Hit a Major Milestone
Ars Technica·Sunday, 7 June 2026
A US startup called Antares has successfully achieved 'criticality' in its small modular reactor — meaning the nuclear chain reaction was self-sustaining for the first time. The reactor isn't generating electricity yet, but this is the key proof-of-concept moment the nuclear industry has been waiting for. It's the first test of its kind in the US.
Why It Matters
Small modular reactors (SMRs) are being watched closely by countries including India, which is exploring them as a clean energy option. This test shows the technology is no longer just on paper.
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