Aalo Atomics, a company specializing in modular nuclear plants for AI data centers, successfully achieved criticality for its Aalo-X Critical Test Reactor on July 4, 2026, at the Idaho National Laboratory (INL). This significant milestone, which marks the first self-sustaining chain reaction within the reactor, met and surpassed a presidential goal for advanced reactor development. Emmet Penney, a notable voice in the nuclear energy sector, extended "Massive congrats to @AaloAtomics!" via social media, highlighting the achievement.
The accomplishment is a key step for Aalo Atomics, which aims to provide reliable power solutions for the rapidly growing AI data center industry. CEO Matt Loszak stated, "Reaching criticality is our most significant milestone to date, as it paves the way for the deployment of the Aalo Pod to power commercial data centers." The Aalo-X Critical Test Reactor, with its 10 MWe design, utilizes the same full-scale core components intended for their commercial reactors.
Aalo Atomics demonstrated remarkable speed, transitioning from its founding to fission in less than three years and from groundbreaking to a sustained chain reaction in under eight months. This rapid progress aligns with the U.S. Department of Energy’s Reactor Pilot Program, which sought to accelerate advanced nuclear technology. The company’s success contributed to the "Four by the 4th" initiative, which saw four advanced reactors achieve criticality by the July 4th deadline, exceeding the initial goal of three.
Looking ahead, Aalo Atomics has already commenced work on a second nuclear reactor for Project Ascension at the INL campus. This commercial-scale system is slated to produce 10 MWe of electricity and power an on-site data center by 2027. The company also recently announced a collaboration with Microsoft and Nvidia to develop an automated co-piloting system for nuclear reactor fleets, further integrating nuclear power with advanced technology.
The company's progress and the experience of its team, including CEO Matt Loszak, are set to be further discussed in an upcoming "Nuclear Barbarians episode," scheduled to drop tomorrow, according to Penney's tweet. This media appearance will likely delve into Aalo Atomics' journey and its implications for the future of nuclear energy and AI infrastructure. Aalo Atomics secured $100 million in Series B funding in August 2025, underscoring investor confidence in its vision.
