VC Money Floods Into U.S. Nuclear Startups as AI Power Demand Explodes
- Global VC funding for nuclear fission and fusion startups has already topped $4.5 billion across 81 companies in 2026, on pace to beat 2025's $6.2 billion record.
- Big Tech figures including Sam Altman and Bill Gates are pouring money into fusion to keep up with AI's ballooning electricity demand.
- Critics warn the startup boom is skipping voluntary safety guardrails and pulling attention from proven large-scale reactor technology.
Venture capitalists are taking a major interest in nuclear energy start ups. Funding is surging for both nuclear fusion and fission firms as the technology becomes an increasingly essential part of a feasible pathway toward sustainable energy security in the face of the artificial intelligence boom.
According to reporting by Axios, global investment in both fission and fusion has topped USD $4.5 billion across 81 companies in 2026 so far. At this pace, by year’s end, this year will shatter 2025’s previous record of $6.2 billion for 93 companies.
Data center hyperscalers are driving up energy demand projections to previously unthinkable levels that will require an all-of-the-above approach to energy development that is likely to prominently feature nuclear energy as a round-the-clock source of zero-emissions electricity. In the United States, the public and private sectors alike are extremely bullish on the technology and clearly eager to usher in a new nuclear era. As a result, the majority of this year’s funding surge is going to U.S. companies.
Big Tech has taken a particular interest in expanding nuclear energy deployment and technological advancement to feed its own ballooning energy needs. Some of the tech sector’s biggest names, including Bill Gates and OpenAI’s Sam Altman, are major investors in and advocates of nuclear fusion as an answer to AI’s ballooning energy problem. "There's no way to get there without a breakthrough," he said at the 2024 World Economic Forum in Davos, Switzerland. "It motivates us to go invest more in fusion."
The Trump administration, too, is a major proponent of nuclear energy expansion, with a particular focus on next-gen nuclear technologies as part of a broader push to "reestablish the United States as the global leader in nuclear energy" and "produce lasting American dominance in the global nuclear energy market." To this end, Executive Order 14301, signed by Trump in May 2025, mobilizes significant resources from the U.S. Department of Energy’s Reactor Pilot Program to fast-track the testing and commercialization of advanced nuclear technologies in order to bring them to scale.
These advanced technologies include nuclear fusion as well as small modular reactors (SMRs) which hold major promise for overcoming some of the hurdles that have been causing nuclear energy to fall out of fashion in the United States. Traditional nuclear power plants are enormously costly and face long timelines and miles of red tape to come online. The country’s most recent traditional nuclear power plant, Georgia’s Plant Vogtle, finally came online years late and billions over budget. The hope is that modular and alternative technologies won’t face the same issues, as they can be built offsite relatively cheaply.
SMRs are still an emerging technology. While one SMR design has been officially approved for development in the United States, and many more firms are seeking approval for their plans, zero SMRs have yet come online in the country. “The U.S. Nuclear Regulatory Commission took about six years to approve the first advanced small reactor design, from fission developer NuScale,” Axios reports. “President Trump has sought to accelerate the process, aiming for 18 months. But that still could give first movers a major advantage in locking down contracts with data centers and electric utilities.”
With the backing of both the federal government and Silicon Valley, it’s no surprise that nuclear startups are going gangbusters. But while the increasing fragmentation and privatization of the nuclear energy sector could be great for innovation and expansion of the technology, it also poses some key drawbacks. For one thing, nuclear startups have so far shown a concerning disregard for voluntary safety guidelines that were tacitly accepted in the nuclear sector until now.
In addition to safety concerns, some critics have argued that a focus on cutting-edge nuclear energy technologies and startups may be diverting energy and funding from proven technologies that would better serve nuclear power capacity addition goals. A recent op-ed for the Wall Street Journal argued that “The administration is chasing unproven technology when it could encourage Wall Street investment in large-scale reactors,” and, as a result, Trump’s nuclear renaissance is stalling.
By Haley Zaremba for Oilprice.com
