Valar Atomics Secures $450 Million to Build Small‑Scale Nuclear Reactors for AI Data Centers

Valar Atomics, a Los Angeles‑area startup founded by 27‑year‑old Isaiah Taylor, announced a $450 million financing round that values the company at $2 billion. The funding, a mix of equity and debt, comes from a roster of defense‑tech investors including Palmer Luckey, Shyam Sankar of Palantir, and Lockheed Martin board member John Donovan. Valar’s plan centers on “gigasites” – industrial campuses that host hundreds of high‑temperature gas‑cooled reactors designed to deliver dense, carbon‑free power for AI data centers and other high‑load applications. The company recently achieved zero‑power criticality for its NOVA Core at Los Alamos and is preparing its Ward250 reactor for power operations in Utah.

Funding Milestone and Investor Backing

Valar Atomics, founded in 2023 by Isaiah Taylor, closed a financing round that raised $450 million, comprising $340 million in equity and $110 million in debt. The round values the company at $2 billion and arrives just months after a $130 million Series A. Investors include Palmer Luckey (Anduril Industries), Shyam Sankar (Palantir Technologies), Snowpoint Ventures, Day One Ventures, Dream Ventures, and John Donovan, a Lockheed Martin board member and former AT&T chief executive.

Technology Strategy: Gigasites and HTGRs

Valar’s core offering is the development of “gigasites,” large industrial campuses that host hundreds to thousands of small, high‑temperature gas‑cooled reactors (HTGRs). Each reactor uses helium as a coolant and TRISO fuel encased in graphite, enabling higher operating temperatures than traditional light‑water reactors. The design aims to provide dense, steady, carbon‑free electricity tailored to the power‑intensive needs of AI data centers, industrial manufacturers, and regions with limited grid capacity.

Progress Toward Commercial Operation

The company announced that its NOVA Core achieved zero‑power criticality at Los Alamos National Laboratory’s National Criticality Experiments Research Centre, marking the first such milestone under the U.S. Department of Energy’s Nuclear Reactor Pilot Programme. While zero‑power criticality is a validation step rather than full power generation, it places Valar ahead of many competitors. Valar is now preparing its Ward250 reactor, a 100‑kilowatt thermal HTGR, for power operations at the Utah San Rafael Energy Research Centre. The reactor was airlifted from California to Utah aboard three C‑17 aircraft in a joint Department of Defense and Energy operation, positioning the unit for operational status before the July 4, 2026 DOE deadline for pilot‑program reactors.

Leadership and Industry Context

Taylor, a self‑taught coder with a family history in nuclear physics, assembled a leadership team that includes former Ultra Safe Nuclear Corporation president Mark Mitchell and former Relativity Space CFO Muhammad Shahzad. Valar operates in a crowded field of advanced‑reactor startups, including TerraPower, Kairos Power, X‑energy, and Oklo, none of which have yet delivered commercial power from an advanced design.

Regulatory Challenges

In April 2025, Valar, alongside several states and fellow reactor startups, sued the Nuclear Regulatory Commission, arguing that the agency’s licensing framework unfairly restricts small‑scale reactor innovation. The lawsuit seeks to shift regulatory authority for low‑power test reactors to individual states. The case was paused amid broader executive actions to overhaul the NRC.

Valar’s $2 billion valuation places it among the most highly valued nuclear startups in the United States. The upcoming performance of the Ward250 reactor will test whether the company can translate its financing and technical milestones into grid‑connected electricity within a three‑year timeframe.