Valar Atomics has closed a Series B funding round of one billion dollars led by Sequoia Capital, the company announced on August 3, 2026. The reactor startup’s valuation triples to six billion dollars. Valar also secured a 200-million-dollar credit line to build a factory that will mass-produce small nuclear reactors for data centers.
Factory replaces one-off projects in reactor building
So far, Valar only operates the Ward 250 test reactor in the US state of Utah. According to the company, it achieved a self-sustaining chain reaction for the first time in June 2026 after seven months of construction. The earlier demonstration reactor NOVA needed about two years for its first chain reaction and only went critical in November 2025 at the nuclear test site in Nevada. With the fresh capital, Valar wants to build a production line that manufactures its compact, helium-cooled high-temperature reactors in series rather than one at a time. Founder and CEO Isaiah Taylor sums up the shift: “A reactor can be built as a project. A fleet has to be manufactured.” Just in March 2026, Valar had raised 450 million dollars at a two-billion-dollar valuation. The current round triples that value within a few months to six billion dollars. Valar is also building its own fuel labs at its reactor sites for the required TRISO nuclear fuel, to control that supply chain itself instead of relying on outside suppliers.
Nvidia tests nuclear power for AI facility in Utah
Valar delivered its first public proof already in June 2026. The Ward 250 reactor at the company’s own test site in Orangeville, Utah, briefly powered an Nvidia AI computer with electricity from nuclear fission. According to the company, it was the first time a private US reactor supplied power to an AI chip. As TechCrunch reports, Nvidia and Valar are now planning a joint 30-megawatt facility in Utah designed to run without any local water use. Conventional data centers often consume more than 2.6 million gallons of water per megawatt each year for cooling. Valar’s closed-loop cooling system is meant to push that demand close to zero by reusing water internally instead of drawing it from the surrounding area. Longer term, the single test site is meant to become a fleet: Taylor talks about eventually hundreds of identical reactors that could power data centers independently of the public grid and its bottlenecks. Neither company has named a concrete start date for construction in Utah, nor a timeline for full grid connection.
Competition for AI’s nuclear power grows
Valar is not the only nuclear startup benefiting from investor appetite for AI-driven atomic power. Rival Antares raised 470 million dollars in July 2026. X-energy went public in April 2026 and likewise raised around one billion dollars. The race for data center power shows up elsewhere too: the EU opened tenders in late July for seven AI gigafactories worth more than 30 billion euros, while SpaceX is even planning data centers in Earth orbit to sidestep rising power demand. The money keeps flowing despite a late-July Nasdaq slide driven partly by doubts over the returns on billion-dollar AI infrastructure spending; nuclear power startups appear unaffected by that skepticism so far. Valar’s six-billion-dollar valuation has not been independently verified – it rests on statements from the investors involved and media reporting. The US government, meanwhile, wants things to move faster still: Valar was added to a program launched by presidential decree to speed up criticality for private test reactors on US soil, and together with several states it is separately suing the nuclear regulator NRC over what it considers excessively slow approval processes.
Whether Sequoia’s bet pays off will be decided on the production line, not at the test reactor. No maker of compact reactors has yet shown that series production can really happen in months rather than years. It also remains open when the planned Utah facility with Nvidia will actually go online – neither company has given a concrete timeline.
