For engineers like Patrick, our Groves isotope test reactor is proof that advanced nuclear can be built differently. Built from the ground up in less than a year and on track to reach criticality this month, Groves is demonstrating a faster, more repeatable path to deployment. Hear Patrick describe the significance of this moment. Learn more about our isotopes work here:

America is building nuclear again, and Oklo is on the front lines. At @INL, construction is advancing on our first commercial Aurora powerhouse, turning engineering, planning, and preparation into real infrastructure. The work at INL is laying the foundation for a commercial deployment that can scale. As demand for reliable power grows, we’re building toward a model designed to move safer and faster than nuclear has ever moved before.  Read more about how Oklo is leading the race to build America’s next generation of nuclear energy in the @WSJ:

“By all accounts and measures, this is the fastest-built, privately sited, privately funded, privately built nuclear reactor in world history.” Oklo CEO Jacob DeWitte took CBS Austin’s @waltmac inside of the Groves Isotope Test Reactor, just days after reaching criticality. Built in less than a year, Groves serves as the technical and operational foundation for Oklo’s commercial isotope production, which will help restore America’s supply of critical isotopes for applications in medicine, manufacturing, research, national security, space exploration, and beyond.  Go inside Groves with @cbsaustin:

There is a lot happening right now. Last week was a good example. We welcomed @ScienceUnderSec and @CongMikeSimpson to @INL, traveled to Texas to see @Oklo’s Groves-1 go critical, and hosted @NASAAdmin Jared Isaacman and @ENERGY Deputy Secretary Danly. Industry. Government. National labs. Never in my career have I seen all three aligned like they are right now. We can’t take this moment for granted. #NuclearEnergy# #AdvancedNuclear# #EnergyDominance# #SpaceExploration#

Oklo CEO Jake DeWitte joined @MariaBartiromo on @MorningsMaria to discuss why Groves reaching criticality is about much more than one reactor. Built in less than a year, Groves demonstrates a new model for advanced nuclear: build, learn, scale, and iterate. As the fastest fully privately financed and built reactor project of its kind, it shows how industry-led innovation, supported by smart policy, can accelerate deployment while helping strengthen America's energy future and domestic isotope production. Watch the interview:

Commissioner Wright recently visited the @oklo Groves Isotope Reactor, a low-power test reactor designed to demonstrate reactor design, build, and operations, and to establish the operating experience needed to support future isotope production facilities.

JUST IN: @Oklo's Groves Isotopes Test Reactor achieved criticality. Congrats!👏 @INL's role in this milestone: 🔹Conducting independent reviews of engineering calculation reports 🔹Providing radiological training 🔹Tailoring occupational, safety & health implementing procedures

CRITICALITY NO. 5! 🕺 On August 5, 2026, at 9:19 PM EST, @Oklo Inc’s Groves test reactor achieved initial criticality at the company’s facility in Lockhart, Texas. It is the fifth nuclear test reactor to go critical under @ENERGY’s Reactor Pilot and Nuclear Energy Launch Pad programs. Congratulations to Oklo Inc.!

@Oklo's Groves Isotope Test Reactor achieved criticality — a great day for nuclear in Texas and for domestic isotope production. Congrats to the whole team. @ENERGY 🇺🇸 #AdvancedNuclear# #Nuclear#

WE HAVE CRITICALITY! Oklo has completed first criticality at its Groves Isotope Test Reactor. Built in less than a year under the @ENERGY’s Reactor Pilot Program, Groves offers a concrete blueprint for future advanced nuclear deployment as the fastest fully privately financed and built reactor project of its kind. Today, Oklo proves that advanced reactors can be built, started, and operated faster than anyone thought possible and shows the world that America can build nuclear again.

We’re beginning our #CountdownToCriticality#. As we approach initial criticality, our engineers and operators will take you inside our Groves Isotope Test Reactor as they conduct the startup tests. Our team has loaded the initial core, tested the control rods and protection systems, and brought purified water into the core under tight chemistry control. These steps are a deliberate “preflight check” that builds confidence that the reactor and its systems are behaving as expected.  These startup tests do more than demonstrate our developing blueprint for future commercial deployments–they show that American nuclear can move from design to startup on timelines that are measured in months rather than years.

Scaling advanced nuclear requires coordination and investment across the full nuclear lifecycle: power, fuel, recycling, and long-term stewardship. @ENERGY’s Nuclear Lifecycle Innovation Campus effort is one of the first programs to bring the whole nuclear lifecycle together. States including Utah, Tennessee, Oklahoma, Louisiana, and Idaho are stepping up with serious proposals to host that full stack infrastructure and the jobs and innovation that come with it. That’s exactly the kind of forward‑looking, transparent competition we need to unlock real advancement in advanced nuclear. Thank you to the Administration, DOE, and the states investing in our country’s nuclear renaissance. Getting this right means more than new projects on a map, it means building durable, integrated nuclear ecosystems that can deliver for Americans. We’re excited to keep working with partners who are ready to invest in full‑stack nuclear deployment.

Oklo CEO Jacob DeWitte joined @CNBCMorningCall to discuss two major milestones for Oklo: startup authorization for our Groves Isotope Test Reactor and our founding membership in Prometheus. Yesterday’s @ENERGY authorization clears the way to load fuel and bring the fastest privately built reactor of its kind to first criticality. This week, Oklo also joined Prometheus, a DOE-supported initiative led by @INL to unleash AI across the nuclear lifecycle. Both of these milestones reflect the momentum behind a new era of nuclear development and the opportunity to use AI to help deliver clean, reliable power more quickly.  Watch:

GREEN LIGHT FOR STARTUP: @ENERGY has authorized Oklo’s Groves Isotope Test reactor to begin nuclear operations. This startup authorization clears the facility and team to bring in fuel, run startup tests, and proceed toward first criticality under its startup plan. In just over 10 months , Groves completed engineering, construction, commissioning, development of operating programs, personnel training, and DOE readiness across all core requirements. Oklo chose the harder path to build a repeatable deployment model on private land using commercially procured fuel and equipment so future Aurora powerhouses, isotope facilities, and fuel cycle projects can build on proven deployment capabilities  instead of starting from scratch. Lessons from Groves are already informing how we build our other capabilities, demonstrating  how advanced nuclear can move faster under DOE’s Reactor Pilot Program while keeping safety front and center. Read more ->

Oklo is excited to be a founding member of Prometheus, an initiative led by @INL and selected by @ENERGY for a $60M phase 1 award over three years. Prometheus brings together 32 partners across national laboratories, academia, and industry to explore how AI can streamline engineering, manufacturing, licensing, and operations to help reduce development timelines and lower the cost of deploying safe, reliable nuclear energy. We look forward to contributing our experience alongside partners across the nuclear ecosystem as we work to help build the next era of energy infrastructure. Read more:

From reactor development to fuel fabrication and isotope production, our projects are taking shape across the country. They're all part of a larger system supporting the growing demands of our energy future. At Oklo we're making real progress and laying the groundwork for a new kind of nuclear tech infrastructure.

Carla is Oklo’s Technical Advisor, with 30 years of experience building and operating nuclear infrastructure. Today, she's helping rebuild America's domestic supply of isotopes, starting with Oklo's Groves Isotope Test Reactor, a project that will expand domestic isotope production while demonstrating a faster, more scalable approach to advanced nuclear deployment. Hear, in her own words, why this work is so meaningful.

Oklo’s momentum is changing the paradigm of how we build advanced nuclear in the United States. Our Groves isotope test reactor is the only reactor built on privately owned land using commercially sourced fuel, equipment, and systems to receive Documented Safety Analysis approval under the @ENERGY Reactor Pilot Program. Oklo CEO Jacob DeWitte spoke with @LizClaman on @FoxBusiness about how this project is establishing a new blueprint for how nuclear can scale in America:

We were in southern Ohio with @Centrus_Energy and local stakeholders, marking a major step forward for Oklo’s plans for a 1.2 GW Clean Energy Campus powered by our Aurora powerhouses. Fuel availability has been a key bottleneck for advanced nuclear, so locking in domestic HALEU from Pike County is a critical step in Oklo’s vertically-integrated, fuel to power model while creating new private investment and jobs in Ohio.