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The U.S. Department of Energy (DOE) startup authorization allows Oklo to load nuclear fuel, conduct startup testing, and proceed toward first criticality.
In just over 10 months, Oklo progressed from groundbreaking to receiving DOE startup authorization for its first reactor at the Groves site.
During that period, Oklo built the reactor facility, established the operating organization, qualified personnel, implemented nuclear programs and procedures, procured fuel and major equipment from commercial suppliers, and completed the DOE authorization process.
The Groves low-power test reactor will demonstrate reactor operations that support Oklo’s plans for commercial-scale domestic isotope production. Groves is a commercial-scale facility, meaning Oklo can repeat the experience with demonstrated experience in siting, building, commissioning, and operating its commercial reactors in the future with confidence in how long it takes and how much it costs to build its isotope production reactors.
LOCKHART, Texas, (BUSINESS WIRE) - Oklo Inc. (NYSE: OKLO) (“Oklo”), an advanced nuclear technology company, today announced it received startup authorization for its Groves Isotope Test Reactor. This authorization, granted under the U.S. Department of Energy (DOE) Reactor Pilot Program, completes DOE’s authorization process and clears the way for fuel loading, startup testing, and reactor operations. Groves is a low-power test reactor designed to demonstrate reactor design, build, and operations, and to establish operating experience needed to support future isotope production facilities. The project advances Oklo’s plans to establish domestic production of critical isotopes for potential use in cancer care, manufacturing, scientific research, space exploration, and national security.
Groves, a privately financed facility, demonstrates nearly every element of a commercially oriented deployment model that Oklo can repeat and scale across future projects. The facility was built on private land, including full-scale civil excavation and construction, and assembled with full-scale systems, components, and fuel either sourced commercially or manufactured by Oklo.
“This facility marks the fastest time that we are aware of to go from greenfield to substantial completion for a full-scale, privately funded and sited reactor in history,” said Oklo co-founder and CEO Jacob DeWitte. “By building on a greenfield site on private land, performing full-scale civil excavation and construction, and procuring fuel and all major components commercially, we demonstrated that the advanced nuclear industry can move at a pace that many did not believe possible. And this experience is fully translatable to future commercial deployments.”
“The U.S. Department of Energy is excited to see another Reactor Pilot Program participant receive authorization,” said Principal Deputy Assistant Secretary for Nuclear Energy Mike Goff. “With the right enabling environment, Oklo has been able to accelerate their progress and is now ready to take the next step with their technology.”
The startup authorization follows a rigorous readiness review, through which DOE confirmed that Oklo has achieved the engineering, organizational, and operational readiness needed to safely receive fuel and begin reactor operations. A readiness review is a critical final step in DOE’s startup authorization process: a multidisciplinary DOE team evaluates whether facility procedures and personnel training are adequate; the facility and equipment conform to the approved design, safety equipment functions properly, and required safety management programs have been implemented. Oklo fully developed these safety management programs in-house rather than relying on an established or pre-existing operating framework within an established facility such as a national laboratory.
“Executing on Groves has meant much more than just a construction project; it has been a valuable part of building and exercising key operational muscle across the Oklo enterprise,” said Oklo co-founder and COO Caroline Cochran. “Starting of a private facility means honing and implementing operating procedures, training programs, security programs, environment, health and safety programs, quality assurance programs and procedures, and much more. Oklo’s centers of excellence on all of these operational aspects now have this experience to bring to all our projects currently in progress and to build on for the future.”
Future Oklo projects will build on the established systems, qualified suppliers, and approved operating programs established through Groves. By establishing a repeatable approach to engineering, construction, commissioning, operations, and regulatory authorization, Groves helps reduce execution risk and accelerate future deployments across all of Oklo’s business units.
The Reactor Pilot Program created a rigorous pathway that enabled construction and organizational readiness activities to proceed while DOE conducted its reviews. Groves demonstrates how that approach can support advanced reactor deployment while maintaining a rigorous focus on safety.
https://oklo.com/newsroom/news-details/2026/Oklo-Receives-U-S--Department-of-Energy-Startup-Authorization-for-Groves-Reactor-Clearing-Way-for-Fuel-Loading-and-First-Criticality/default.aspx