Valar Atomics Seeks $6B Valuation in $1B Nuclear Fundraise

The Sequoia-backed startup just proved its reactor can power an Nvidia AI chip, and investors are betting big on nuclear as the next infrastructure layer for AI.

The Nuclear Startup Fueling AI's Energy Crisis

Valar Atomics, the three-year-old startup building small modular nuclear reactors (SMRs), is in talks to raise a $1 billion equity round at a valuation of roughly $6 billion, according to sources familiar with the company. Sequoia is expected to lead the deal, making this one of the largest nuclear energy raises in history from a pure-play venture capital firm.

The El Segundo, California-based company has already raised $450 million across equity and debt at a $2 billion valuation, per a source cited by TechCrunch. But the new round would represent a 3x jump in valuation in under a year, fueled by surging demand for AI data center power and a landmark technical achievement: Valar's reactor successfully powered an Nvidia AI chip earlier this month.

This is not just another fundraising story. It is a signal that the venture capital world has identified nuclear energy as the next bottleneck in AI infrastructure. Data center electricity demand is projected to grow sharply over the next several years, and utilities in many regions are years away from adding enough new capacity. That vacuum has turned nuclear power long plagued by cost overruns and regulatory bottlenecks into one of the most closely watched corners of the AI infrastructure boom.

The $1B Raise and $6B Valuation

The structure of the new round is noteworthy. Part of the capital has already been raised at a lower valuation, with Valar closing tranches at varying prices. These so-called tranched rounds, executed at different times and at different valuations, are becoming increasingly common in today's AI-fueled fundraising environment. They create the perception that capital was invested at a single, uniform valuation, when in reality investors in the same round can end up paying different prices for the same company. That distinction matters more than ever as outsiders try to benchmark red-hot startups against one another.

Valar counts some heavyweight backers beyond Sequoia. Palmer Luckey, the Anduril founder, and Shyam Sankar, Palantir's chief technology officer, are among its investors. The company's founder, Isaiah Taylor, dropped out of high school at 16 and is now 27. He has said his grandfather worked as a nuclear physicist on the Manhattan Project. The combination of deep tech heritage and aggressive execution has made Valar a standout in the nuclear startup ecosystem.

Other players chasing the same opportunity include Oklo, backed by Sam Altman, and TerraPower, backed by Bill Gates. But Valar's rapid progress and willingness to take on the Nuclear Regulatory Commission (NRC) directly have set it apart.

The Reactor That Powered an Nvidia Chip

Earlier this month, Valar announced that its NOVA core a helium-cooled, high-temperature gas reactor achieved criticality and provided a small amount of power to an Nvidia AI chip. This was the first time a nuclear startup has claimed to achieve criticality, the point at which a nuclear reactor sustains a self-sufficient chain reaction. Valar made the achievement in partnership with Los Alamos National Laboratory, using a blend of the startup's fuel technology and key structural components provided by the lab.

To be precise, what Valar achieved is called cold criticality or zero-power criticality. This means the reactor sustained a chain reaction but did not generate enough heat to produce usable power. Think of it as the first heartbeat of a reactor proof that the physics holds, but not yet a fully functional power plant. The company has said it intends to turn on a fully functional model of its reactor by July 4, 2027, under a Department of Energy pilot program created by executive order.

Concurrently with the proof-of-concept demonstration, Valar and Nvidia announced a partnership to explore the development of nuclear energy to power future AI data centers. This is significant because Nvidia, which produces the chips that dominate AI training and inference workloads, is effectively placing a strategic bet on nuclear as a power source for the next generation of data centers.

What Happens Next for Valar Atomics

Several big questions remain. Valar's technology is based on a helium-cooled, high-temperature gas reactor design that the company says will eventually be deployed at industrial scale, with hundreds of units powering data centers. But SMRs are still nascent, and it is not at all clear how long it will take to manufacture and deploy them at scale.

The regulatory picture is also fluid. Valar has taken an aggressive legal stance toward the NRC, joining several states and rival startups in a lawsuit arguing the agency wrongly applies the same lengthy licensing process to small test reactors that it uses for full-size commercial plants. The case has been repeatedly paused, suggesting a settlement may be in the works. Meanwhile, a Department of Energy pilot program created by Trump executive order has allowed 11 nuclear startups including Valar to develop reactors in a research capacity, bypassing the lengthy and complex NRC review.

For founders and operators building AI infrastructure, the Valar story is not just about one company. It is about a structural shift in how the technology industry thinks about power. If nuclear startups can deliver on their promises, the energy bottleneck that currently constrains data center growth could be removed within a decade. If they cannot, the AI industry will face hard choices about where to build and how to power the next generation of compute.

Valar's $6 billion valuation is a bet that the answer is net new nuclear capacity built by software-era founders, not regulated utilities. Whether that bet pays off will be one of the defining questions of the AI infrastructure era.