Valar Atomics has raised $1 billion in Series B funding led by Sequoia Capital, tripling the nuclear startup's valuation to $6 billion just months after its previous round, as investor appetite for nuclear power grows alongside AI's surging electricity demand.
Founded roughly three years ago in Hawthorne, California, Valar is pursuing a manufacturing-first approach to nuclear energy: building standardized, factory-produced small reactors rather than the custom, multibillion-dollar construction projects that have historically defined the industry. The company's Ward 250 reactor, a high-temperature gas-cooled design fueled by TRISO-coated uranium and cooled by pressurized helium, achieved self-sustaining criticality in June and, weeks later, generated electricity that powered an Nvidia AI chip -- the first time a US nuclear reactor has supplied power directly to AI computing hardware.
Sequoia partner Shaun Maguire is joining Valar's board as part of the investment, which arrived alongside a separate $200 million credit facility led by Erebor Bank and JPMorgan, bringing the company's total new financing to $1.2 billion. The jump from a $130 million round less than a year ago to a $1 billion Series B illustrates how quickly investor appetite for nuclear energy has shifted as AI infrastructure pushes electricity demand higher than existing grids can comfortably absorb.
Valar and Nvidia are now planning a 30-megawatt nuclear-powered AI facility in Utah, the first commercial application of the partnership. The company still needs a commercial license from the Nuclear Regulatory Commission before wider deployment, and small modular reactors remain unproven at commercial scale outside China and Russia -- meaning the real test of Valar's thesis is still ahead, not behind it.
For founders and investors in energy and deep tech, Valar's raise is a clear signal that nuclear power has moved from a niche climate bet to a direct AI infrastructure play, with capital now flowing at a pace that matches the urgency of the power problem it's trying to solve.