Stockholm-based Blykalla has formed a partnership with U.S. developer Oklo to advance their work on small modular fast reactors. The agreement covers joint research, component sourcing, and regulatory coordination, while also bringing a $5 million investment from Oklo into Blykalla’s current funding round. For Blykalla, the collaboration is intended to lower costs, improve access to suppliers, and share practical licensing insights between the European and U.S. contexts. By aligning with another fast reactor company, Blykalla aims to strengthen the foundations for its SEALER technology while contributing to a broader effort to build reliable supply chains and regulatory pathways for advanced nuclear deployment.
Blykalla is a developer of advanced small modular reactors (SMRs), focused on lead-cooled fast reactor technology. Its SEALER design is a compact 55 MWe unit aimed at providing safe, efficient, and scalable power for industrial applications. The company works with partners across Europe to develop supply chains, regulatory pathways, and operational expertise for advanced nuclear deployment.
“Oklo and Blykalla share a practical, industrial approach to bringing advanced fission to market,” said Blykalla CEO Jacob Stedman. “Coordinated component sourcing and targeted joint R&D can unlock efficiencies for both companies and help our suppliers plan for scale, regardless of which side of the Atlantic they are on.”
Oklo is an advanced nuclear company developing fast reactors to deliver clean, reliable, and compact power. The company focuses on sodium-cooled reactor designs and works on fuel, component supply, and licensing innovations to support industrial and commercial deployment. Oklo also engages in research on nuclear fuel recycling and collaborates with U.S. national laboratories and regulatory agencies to advance advanced fission technology.
“This partnership strengthens the growing advanced reactor ecosystem in the face of unprecedented global demand for power,” said Oklo co-founder and CEO Jacob DeWitte. “By teaming up on suppliers, materials data, and licensing insights, we can shorten critical paths to deployment and stay focused on delivering reliable, clean power to customers, while recognizing that we have more to gain from cooperating than from competing.”
Under a Joint Technology Development Agreement, Oklo and Blykalla will share insights on materials, components, non-nuclear supply chain sourcing, and licensing best practices across the U.S. and Sweden. Through increased cooperation and coordination, both developers aim to reduce costs and schedule risks. This is one of the first transatlantic partnerships in the advanced nuclear reactor sector. Aligning fast reactor developers across Europe and the U.S. shows how advanced nuclear companies can work together on fuel, supply chains, and regulation to accelerate commercialization globally, based on a shared commitment to advanced nuclear technology as a cornerstone of the clean energy transition.
Together the fast reactor companies will examine shared suppliers for reactor-agnostic equipment to improve availability, schedules, and cost. Oklo may also supply select components for Blykalla’s direct use to strengthen a vertically integrated, potentially cross-border, supply chain. In parallel, Oklo and Blykalla will pursue targeted R&D and regulatory analysis to boost reliability and lower lifecycle costs without requiring design changes.
Blykalla is developing a passively safe, highly compact 55 MWe lead-cooled fast reactor (known as SEALER) based on more than 25 years of research. Blykalla is currently raising its A2 round, which Oklo will co-lead. Oklo is developing its sodium-cooled fast-reactor powerhouses of up to 75 MWe, with a focus on deployment at U.S. sites to serve industrial, defense, and data-center customers
By linking efforts across the U.S. and Europe, Oklo and Blykalla are demonstrating how advanced reactor developers can align on fuel, supply chains, and regulation to accelerate commercialization globally. The partnership reflects a shared commitment to making advanced reactors a cornerstone of the clean energy transition, delivering reliable power for industry, data centers, and future electrification needs. Oklo’s focus on selling power, not plants, to the U.S. market has led to both international and domestic partnerships across the technological and regulatory landscape, including agreements with Siemens, Korea Hydro & Nuclear Power, Liberty Energy, and ABB, aimed at ensuring best-in-class turbines, controls, and grid integration.
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