Advanced Reactors

Aalo Atomics Becomes Fourth US Company To Achieve Demonstration Reactor Criticality

By David Dalton
6 July 2026

Aalo-X test reactor is precursor to advanced ‘Pod’ nuclear system

Aalo Atomics Becomes Fourth US Company To Achieve Demonstration Reactor Criticality
Aalo said criticality was achieved in the early morning hours of 4 July. Courtesy Aalo Atomics.
Aalo Atomics, the US company building fully modular nuclear plants to power AI data centres, has demonstrated criticality for its demonstration Aalo-X Critical Test Reactor at Idaho National Laboratory (INL), meeting president Donald Trump’s goal of having at least three advanced reactors achieve the landmark by 4 July 2026.

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