• X-energy closes an oversubscribed $700 million Series D round to scale its Xe-100 SMR and TRISO-X fuel supply chain, backed by major institutional investors.
• Funding supports a commercial pipeline of more than 11 GW — roughly 144 advanced small modular reactors — across the US and UK.
• Strategic partnerships with Dow, Amazon and Centrica position advanced nuclear as a core component of long-term energy security and decarbonization strategies.
A decisive capital injection for next-generation nuclear
X-energy has raised approximately $700 million in an oversubscribed Series D round, bringing new financial weight to one of the sector’s most closely watched advanced nuclear developers at a moment when demand for firm, low-carbon power is accelerating. Led by Jane Street and joined by new investors including ARK Invest, Galvanize, Hood River Capital Management, Point72, Reaves Asset Management and XTX Ventures, the round also saw renewed support from existing backers such as Ares Management funds, Corner Capital, Emerson Collective, NGP and Segra Capital Management.
The funding deepens investor confidence in the company’s commercial strategy, which centres on the Xe-100 high-temperature gas reactor and its associated TRISO-X fuel — technologies that are now anchoring long-range decarbonization plans for several global corporations.
“The response and commitment from the participants in this financing round is a strong affirmation of the role X-energy expects to play in shaping the future of energy,” said Founder and Executive Chairman Kam Ghaffarian. “When I founded X-energy, I envisioned a company that could redefine how to make advanced nuclear energy accessible, affordable, and essential to an energy abundant future. With the support of our investors, both new and existing, we are closer to realizing that vision.”
Scaling a supply chain built for global expansion
X-energy plans to deploy the capital toward expanding its supply chain and delivery capabilities as it prepares to execute an orderbook exceeding 11 GW — equivalent to about 144 advanced small modular reactors. That scalability is central to the firm’s strategy: SMRs have gained traction among both governments and utilities seeking firm power that can complement variable renewable energy, support grid stability and reduce exposure to volatile fossil fuel markets.
“We are highly focused on building a world-class project and technology delivery platform to accelerate the commercialization of our Xe-100 reactor and TRISO-X fuel,” said CEO J. Clay Sell. “The success of this financing round allows us to deepen partnerships with critical deployment partners and invest in a robust and reliable supply chain to successfully deliver projects with our customers.”
Investors see the SMR market as poised for rapid growth. The convergence of new industrial loads — data centres, green hydrogen facilities, manufacturing electrification — with tightening energy and climate commitments has created a renewed strategic rationale for advanced nuclear. For C-suite leaders, it is increasingly viewed not as experimental technology but as a cornerstone of long-term decarbonization portfolios.
RELATED ARTICLE: Amazon Backs X-Energy in $700M Funding Round to Scale Advanced Nuclear for Clean Power
Anchor projects with Dow, Amazon and Centrica
X-energy’s first planned deployment is a four-unit Xe-100 plant at Dow Inc.’s UCC Seadrift operations on the Texas Gulf Coast. Part of the US Department of Energy’s Advanced Reactor Demonstration Program, the project is currently under review by the Nuclear Regulatory Commission. If approved, it would become one of the first advanced nuclear facilities supporting industrial decarbonization at scale.
Corporates with large and rising electricity demand are emerging as major buyers. Amazon has secured options to deploy more than 5 GW of Xe-100 units across the US by 2039, beginning with the Cascade Advanced Energy Facility in Washington state in partnership with Energy Northwest. In the United Kingdom, X-energy and Centrica have mapped out plans for up to 6 GW of deployments, positioning the technology as a contributor to the UK’s long-term energy resilience strategy.
Fuel capability as a competitive advantage
X-energy is also constructing the United States’ first dedicated advanced nuclear fuel fabrication facility for TRISO-X, the company’s proprietary high-assay fuel designed for high-temperature reactors. Fuel availability is emerging as a central bottleneck for the global SMR sector, and companies capable of producing HALEU at scale are expected to hold a strategic advantage as countries move to diversify their energy mixes.
Together, the planned reactor fleet and fuel facility signal a vertically integrated model aimed at reducing deployment risk — one of the main barriers to nuclear project financing. For institutional investors, that combination offers visibility at a time when the market is rewarding technologies capable of delivering predictable, 24/7 low-carbon power.
What global decision-makers should watch
For governments, the size of this round reflects a rising belief that advanced nuclear is shifting from conceptual to commercially viable — a trend likely to influence national energy security strategies and regulatory timelines. For corporates, the partnerships with Dow, Amazon and Centrica illustrate how major energy buyers are beginning to lock in long-term access to clean firm power to hedge rising loads and climate obligations.
As electrification accelerates across industries and economies, X-energy’s financing demonstrates how the global energy system is likely to evolve: a broader mix of low-carbon technologies, with advanced nuclear occupying a growing share of the baseload that renewables cannot supply alone.
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