Valar Atomics has raised $1 billion in a Series B round led by Sequoia Capital, giving the nuclear startup the capital to move from demonstrating small reactors to producing them at scale.
On the one hand, the funding values the company at about $6 billion. On the other hand, Valar has also secured a separate $200 million credit facility.
The three-year-old company is developing small modular nuclear reactors designed to provide reliable electricity for large industrial facilities, including AI data centers.
Sequoia partner Shaun Maguire will join Valar’s board, while investors including Atreides Management, Point72, Snowpoint Ventures, Valor Equity Partners and others participated in the round.
Valar Has Already Shown Its Reactor Can Power AI Hardware
The funding comes shortly after Valar reached a significant technical milestone.
In June, its Ward 250 reactor completed a zero-power fueled criticality demonstration at the Utah San Rafael Energy Lab as part of the U.S. Department of Energy’s Reactor Pilot Program. The test confirmed that the reactor could sustain a controlled nuclear fission chain reaction at low power.
Valar subsequently demonstrated that the reactor could generate electricity for an Nvidia Blackwell-based AI system. The company and Nvidia also announced plans to develop a 30-megawatt nuclear-powered AI facility in Utah.
This demonstration gives the new funding a more specific purpose, with Valar now trying to turn a working reactor design into a manufacturing operation capable of producing reactor fleets.
AI Is Creating a New Demand for Power
The timing also reflects a much larger problem facing the technology industry.
The Electric Power Research Institute (EPRI) says data centers could account for up to 9% of U.S. electricity consumption by 2030, with AI among the major drivers of new demand. The department has also identified nuclear power and small modular reactors as potential sources of the firm electricity data centers require around the clock.
The pressure is already affecting infrastructure planning. For instance, the DOE’s 2026 National Transmission Needs Study identified data centers as one of the major sources of electricity load growth and said additional transmission infrastructure is urgently needed.
That is why nuclear is attracting attention from both technology companies and investors. Microsoft, Amazon, Google, and Meta have all pursued nuclear power agreements or projects for their expanding data center infrastructure, while the U.S. government is also supporting advanced reactor development.
The Investment Case Is Getting Bigger
Valar’s $1 billion round shows how quickly the conversation around AI power requirements is moving into the private capital market.
The company is competing with other nuclear startups pursuing similar opportunities, including Antares Nuclear, Deployable Energy and Aalo Atomics, all of which reached criticality milestones this year.
For Valar, however, the immediate challenge is proving that these reactors can be manufactured, deployed, and operated economically at commercial scale, especially for AI data centers.
“One day, these reactors will transport us throughout the solar system to places that other energy cannot reach,” the company said in its announcement.
The $1 billion investment gives the company substantially more resources to attempt that transition. If Valar succeeds, nuclear reactors could become part of the infrastructure being built alongside the next generation of AI computing.
