Three small nuclear reactors have achieved criticality, meeting a deadline set by former President Donald Trump for July 4, 2026. The reactors, developed by Valar Atomics, Antares Energy, and Deployable Energy, successfully sustained a stable chain reaction, according to the Department of Energy (DOE). This milestone is part of a broader initiative to promote small modular reactors in the United States.
Aalo Atomics Progress
Aalo Atomics, another startup, is nearing criticality with its Aalo-X reactor at the Idaho National Laboratory. Although CEO Matt Loszak described the event as a "nuclear Burning Man," the company has not yet reached the critical state. In a post on X, Chief Technology Officer Yasir Arafat indicated that while atoms are splitting and neutrons are multiplying, they are still in the process of achieving full criticality.
Background on the Initiative
The goal of the Reactor Pilot Program, initiated by Trump's May 2025 executive order, was to jumpstart at least three reactor startups by the 250th anniversary of the United States. Bob Boston, head of the Idaho Operations Office, noted that this period has been the busiest of his career as the DOE supports these small reactor projects. The successful achievement of criticality by the three startups represents a significant step forward in the development of nuclear energy in the U.S.
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The advancements in small modular reactors could influence energy markets, particularly in sectors focused on nuclear energy and clean technology. Increased interest in nuclear power may lead to higher investments in related companies and technologies. Investors will watch for further updates on Aalo Atomics' progress and any regulatory developments regarding small modular reactors.