President Donald Trump used an Oval Office event on Friday, July 24, 2026, to announce that four American nuclear energy startups have successfully proven their reactor technologies, a milestone the administration is calling a turning point for the country's nuclear industry. Trump was joined by Energy Secretary Chris Wright and the leaders of the four companies involved, framing the achievement as the start of a new era of American energy dominance.
Four Companies, One Deadline
The event celebrated a goal Trump set 14 months earlier, when he signed four executive orders directing the Department of Energy to establish a pilot program aimed at getting at least three advanced reactors to achieve criticality, the point at which a nuclear reactor sustains a stable chain reaction, by July 4, 2026, the country's 250th anniversary. Not three, but four companies hit the mark: Antares Nuclear, based in Torrance, California, reached criticality first on June 4 at Idaho National Laboratory with its Mark-0 microreactor. Valar Atomics followed on June 18 at Utah's San Rafael Energy Lab with its Ward 250 reactor. Deployable Energy crossed the line on July 1 with its Unity reactor, also at Idaho National Laboratory. Austin-based Aalo Atomics came last, achieving criticality with its Aalo-X reactor in the early hours of July 4, just before the deadline.
"Most believed the goal was impossible, but I'm delighted to say that four companies succeeded in meeting that deadline, four of the greatest in the world at this subject," Trump said at the event.
How the Administration Is Framing the Milestone
According to White House Office of Science and Technology Policy Director Michael Kratsios, these are the first new privately funded advanced reactors activated in the United States in more than 50 years. Separately, Antares Nuclear's reactor has been described as the first privately funded non-light-water reactor to achieve criticality in four decades, a related but more specific claim about that particular reactor design. Energy Secretary Wright framed the broader shift bluntly, saying the American nuclear industry had gone quiet over the past three or four decades while Russia and China built most of the world's new reactors, and declaring that period over.
Faster Approval, After Years of Delay
Trump also used the event to criticize how long nuclear projects have historically taken to get approved. "In the past, it often took six years or more to approve a reactor design, if they were ever approved at all. Most of them didn't get approved, and maybe rightfully so," he said, before adding, "But now, America is building again. America is dreaming again, and we're leading the world in pioneering the next generation of nuclear power. There's nobody even close." The comment reflects a broader effort under the May 2025 executive orders, which set an 18-month deadline for the Nuclear Regulatory Commission to decide on new reactor construction and operation licenses, down from timelines that have historically stretched past a decade for some projects.
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The Bigger Policy Push Behind the Announcement
Friday's event is a milestone within a much larger goal. The May 2025 executive orders set a target of expanding U.S. nuclear capacity from roughly 100 gigawatts today to 400 gigawatts by 2050, alongside efforts to rebuild domestic uranium mining and enrichment capacity and reduce reliance on foreign nuclear fuel supply chains. The orders also created a Defense Department partnership with the Energy Department aimed at deploying nuclear reactors directly on military installations, with a goal of having reactors on military sites by 2028.
Why AI Data Centers Are Central to the Story
Much of the commercial motivation behind this reactor race is tied to the explosive growth in electricity demand from artificial intelligence data centers. Aalo Atomics has said its immediate target market is data centers, and the company is expanding into a million-square-foot manufacturing facility this year to begin mass-producing its modular reactor design. Valar Atomics has gone a step further, already connecting power from its Ward 250 reactor to an Nvidia chip as part of a broader partnership to build a 30-megawatt nuclear-powered data center in Utah. According to the World Nuclear Association, the country's existing 94 nuclear reactors supplied about 18% of U.S. electricity in 2024, a share the administration hopes to grow substantially as AI-driven demand continues to climb.
A Military Angle, Too
Beyond data centers, at least one of the four companies is explicitly targeting a defense application. Antares Nuclear co-founder and CEO Jordan Bramble said the company sees its reactors as a resilient energy source for the "Golden Dome" missile defense system, Trump's proposed shield against incoming missile threats, along with potential uses for high-powered space assets and undersea autonomy. Bramble said Antares is aiming to put reactors on U.S. military installations before 2028.
Criticism From Democratic Lawmakers
Not everyone has welcomed the pace of these changes. Democratic Representative Salud Carbajal of California criticized Trump's nuclear executive orders last year, calling them "reckless" for ramping up nuclear power development while reducing public input and weakening the Nuclear Regulatory Commission's ability to ensure safety for communities near nuclear plants. That criticism reflects a broader tension in the push for faster nuclear deployment: proponents argue that outdated regulatory timelines have needlessly held back a proven, low-carbon energy source, while critics warn that compressing review timelines and reorganizing the NRC could weaken independent safety oversight.
The Case for and Against Nuclear Expansion
Proponents of nuclear energy point to its around-the-clock reliability, zero-emission electricity generation, and comparatively small physical footprint relative to the power it produces. Critics counter that nuclear projects remain expensive and carry the risk of catastrophic accidents, pointing to the 2011 Fukushima Daiichi disaster in Japan, where an earthquake and tsunami triggered a reactor blackout and the release of radioactive material into the surrounding environment. Both sides of that debate remain active as the current wave of advanced reactor projects moves from testing toward commercial licensing.
What Comes Next
Reaching criticality is a significant technical milestone, but it isn't the same as commercial deployment. Several of the companies involved, including Aalo Atomics, have said they plan to submit commercial licensing applications to the Nuclear Regulatory Commission later this year, the next major hurdle before these reactor designs can be built and sold at scale. Idaho National Laboratory Director John Wagner said Friday that he's never seen government, private industry, and national laboratories work together this effectively, a sentiment echoed by several of the company executives who credited the compressed federal timelines with accelerating progress that has historically taken far longer.
Frequently Asked Questions
What did Trump announce?
Trump announced that four American nuclear startups, Antares Nuclear, Valar Atomics, Deployable Energy, and Aalo Atomics, successfully achieved reactor criticality ahead of a July 4, 2026 deadline he set in 2025.
Is this really the first time in decades for this kind of reactor?
According to the White House, these are the first new privately funded advanced reactors activated in the U.S. in more than 50 years, though the "four decades" figure specifically applies to Antares Nuclear's particular reactor design.
Why does this matter for AI data centers?
Several of the companies, including Aalo Atomics and Valar Atomics, are explicitly targeting AI data centers as customers, citing surging electricity demand as a key driver behind the push for faster nuclear deployment.
Has anyone criticized this push?
Yes. Democratic Representative Salud Carbajal has called Trump's nuclear executive orders "reckless," arguing they reduce public input and weaken Nuclear Regulatory Commission oversight.
What happens next for these reactors?
Reaching criticality is a testing milestone, not full deployment. Companies like Aalo Atomics still need to submit commercial licensing applications to the Nuclear Regulatory Commission before their reactors can be built and sold commercially.
Conclusion
Friday's Oval Office event marks a genuine milestone for the U.S. nuclear industry, four privately funded companies reaching reactor criticality within a single month, ahead of a deadline many in the industry doubted was achievable. Whether this translates into the broader nuclear renaissance the administration is promising will depend on what comes next: commercial licensing, financing, construction at scale, and continued public trust in a technology that carries both major promise and real risk. With AI-driven electricity demand climbing and military applications now part of the conversation too, nuclear power's role in America's energy strategy looks set to keep growing, even as the debate over how fast that growth should happen, and how much oversight should come with it, continues.
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