Nuclear Firm First in US to Produce Power From Advanced Reactor

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Bloomberg

Valar Atomics Inc., a California-based nuclear startup, generated power from an advanced reactor to run an Nvidia Corp. AI chip. While just a trickle of electricity was produced, it’s the first time a next-gen reactor has done so in the US.

Valar’s Ward 250 reactor was connected to the Nvidia Blackwell chip during a demonstration Wednesday at the company’s site in Utah, and used to temporarily host a website. The two companies also announced an agreement to jointly explore ways to develop nuclear-powered AI systems. 

The latest step follows the reactor reaching “criticality” last month, marking the start of a self-sustaining fission reaction. Valar is part of a wave of companies developing next-generation nuclear technologies that use new materials and designs intended to improve safety and performance. However, the industry is still in its early stages, and no US advanced reactors are commercially available.

©2026 Bloomberg L.P.

By Will Wade

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