Valar Atomics is looking to raise $1 billion in a financing round that would value the nuclear startup at $5 billion, according to people familiar with the matter. Sequoia is in talks to lead the round. The news comes days after the company achieved nuclear criticality at its test site in Utah.
Criticality at the Utah test site
The company reached a key technical milestone — nuclear criticality — at its Utah facility just before the financing talks became public. Criticality means the reactor sustained a controlled nuclear chain reaction, a necessary step for any fission-based power system. The test site is not a commercial reactor but a demonstration unit designed to prove the company's core technology works.
Sequoia's potential lead role
Sequoia, one of Silicon Valley's most prominent venture firms, is in advanced discussions to anchor the round. The firm has been increasing its bets on advanced nuclear technology, viewing it as a potential solution for round-the-clock clean energy. A deal hasn't been finalized, and terms could still change.
What the money would fund
The $1 billion would go toward building a full-scale commercial reactor and scaling up manufacturing. Valar Atomics has said it aims to deploy its first commercial unit by the early 2030s. The company's design uses a molten salt coolant, which it claims is safer and more efficient than traditional water-cooled reactors.
Regulatory and market context
The U.S. Nuclear Regulatory Commission has not yet licensed any advanced reactor design for commercial operation. Valar Atomics has been working with the NRC on a pre-application review, but a formal license application is still at least a year away. The company will also need to secure site permits and environmental approvals.
The financing round, if completed, would be one of the largest ever for a private nuclear startup. It reflects growing investor appetite for nuclear power as a carbon-free baseload source, even as the industry faces high upfront costs and long development timelines.
Valar Atomics declined to comment on the financing talks. Sequoia did not respond to a request for comment.
