Copenhagen Atomics

What would you like to know about Copenhagen Atomics? Ask your questions below 👇 This Friday, co-founders CEO Thomas Jam Pedersen and CTO Aslak Stubsgaard will sit down to give an update on CA and answer some of the many questions we receive. We’ll record the conversation and publish the full video on our YouTube channel. Before we do, we’d love to hear from you. What would you like to know about CA, the molten salt reactor industry, or the people behind the company? Like questions you’d like us to answer, so we can see what interests you.

@SpaceElevator7 It is. But it is also much more expensive.

@CphAtomics I thought Hastelloy-N was already found to be pretty corrosion resistant? From the Molten Salt Reactor Experiment.

Did we just solve the corrosion challenge in molten salt reactors? Our experiments show that corrosion drops dramatically when molten fluoride salts are highly purified. In tests with the University of Liverpool, stainless steel showed very low corrosion rates even at very high temperatures. Read here: copenhagenatomics.com/news/corrosion…

@MrBighe71088399 Moisture, oxides and metal traces.

@CphAtomics What are the contaminants causing the corrosion?

Read more here: copenhagenatomics.com/news/securing-…

Copenhagen Atomics will collaborate with Rare Earths Norway to secure future thorium supply. The agreement supports the development of a European supply chain for the fertile material that powers our molten salt reactors and marks another step toward commercial deployment.

@AnthonyAus64368 @GreenTyler27 We're unfortunately not the first to build a thorium molten-salt reactor, but we will certainly be among the first. But indeed, we'll be the first to build it with the onion-core design, which allows for greater efficiency and thereby lower energy costs.

@GreenTyler27 Copenhagen Atomics is the first ever to build thorium reactors. This will disrupt the entire global energy sector, with unbelievable low energy prices and fast deployment. Copenhagen Atomics has built more hardware and conducted more testing than most other nuclear companies.

One Nation and emissions free nuclear energy in Australia 🇦🇺 Australia may have entered the nuclear energy conversation later than other developed nations, but that does not mean we have missed our opportunity. Not at all. With modern reactor technology and Australia’s engineering capability, we are fully capable of delivering safe, zero-emissions nuclear generation to power the industries of the future including AI, advanced manufacturing and strategic national defence. Nearly every other comparable advanced economy operates with some version of nuclear power. Suggesting Australia is somehow incapable reflects hesitation, not reality. Wind, solar and storage absolutely have a role in a balanced energy mix. But the marginal energy pricing situation currently unfolding in the National Electricity Market shows why intermittent generation alone cannot guarantee affordability or reliability. A handful of high-priced five-minute dispatch intervals when wind drops or solar fades can erase the savings from hours of low-cost renewable output. Without firm, dispatchable local generation, states like South Australia remain exposed to volatility and dependence on interstate imports. As I’ve been saying for months, energy grid resilience requires diversified, localised generation capacity in every state. Nuclear should be part of that mix not as an ideological replacement for our renewables, but as the stabilising backbone that makes the entire system work. That is how we deliver affordable, reliable, emissions-free power for the next generation of Australians.

Have you seen the latest video from Two Bit da Vinci regarding Copenhagen Atomics? Watch it here: youtube.com/watch?v=47GDEx…

🇩🇰 Copenhagen Atomics Validates Core Molten Salt Technology With Two Years Of Continuous Pump Operation. #NuclearPower #NuclearEnergy Next-gen #nuclear reactor developer says testing dramatically reduces risk later in development process 👉 nucnet.org/news/copenhage…

@RussRest The reactors will be running on the same fuel for decades.

@CphAtomics Decades? I seem to remember you saying that the entire unit has to be scrapped and stored after 5 years of use. Meaning, you will run a perpetual business of delivering, then reclaiming these things all over the world... forever.

Copenhagen Atomics is different. That is the point. In nuclear energy, very different technologies are grouped under the same labels. It sounds neat. It is also misleading. Our molten salt reactors run for decades on the same fuel. That changes what scaling nuclear can actually look like. Read the full article here: copenhagenatomics.com/news/copenhage…

New YouTube collab 🎬 Europe’s Foundry (euFoundry) just released an episode featuring Copenhagen Atomics, with Thomas Jam Pedersen, Tobias Ravn Thomsen, and George Swalwell. Advanced nuclear is not a slide deck. It is hardware built, tested, and improved through iteration. Watch: youtu.be/oeaQJD0rspM?si…

Happy Holidays from all of us at Copenhagen Atomics 🎄 As we pause for Christmas, we’d like to thank everyone who has followed, supported, collaborated with, and challenged us throughout 2025. Our mission remains unchanged: contributing to a future with clean, scalable, and affordable energy. Progress takes persistence, openness, and long-term thinking, and we’re grateful to be part of a community that shares these values. Wishing you a peaceful Christmas 🎄⚛️

Along the road to Switzerland, there are many steps. This is one of them. Copenhagen Atomics and PSI have published a peer-reviewed study validating molten-salt reactor depletion modelling under real MSR conditions. For the upcoming 1 MW Molten Salt Experiment, three independent codes (OpenMC, Serpent, EQL0D) were benchmarked across increasingly complex models with circulating fuel and online fission-gas removal. The result: strong multi-code agreement and validation of OpenMC’s continuous reprocessing framework. Accurate radionuclide inventories are the foundation of safety analysis and regulation. This work shows that modern MSR behaviour can now be modelled with confidence. Congrats to Lorenzo Chierici and Alessio Rossi on a state-of-the-art validation for molten-salt systems. frontiersin.org/journals/nucle…

@echo42null None is currently planned. But if a future one is planned, it will likely be announced via our newsletter, which you can sign up for on our website.

@CphAtomics Do you have showcase day or open days in Denmark or Switzerland for Investors or in general?

Last Friday, we celebrated a big milestone at Copenhagen Atomics 🎉 One of our molten salt loops has now reached 2 years of cumulative runtime, the longest runtime yet. A key step toward proving reliability before full reactor testing in Switzerland. More testing ahead! ⚛️

@grok @ScubaSteveGamin @grok the output of Copenhagen Atomics' commercial reactor is approx. 42 MWe (100 MWth). It is our test reactor in Switzerland that will be 1MWth.

Radiant Nuclear's Kaleidos microreactor outputs ~1 MWe (electric) from 3.5 MWt (thermal). At similar micro scale (1-10 MWe): - SMRs (e.g., Westinghouse eVinci): 1-5 MWe - MSRs (e.g., conceptual small designs like Copenhagen Atomics): ~1-5 MWe - Other (e.g., Oklo Aurora PWR): 1.5 MWe Larger SMRs reach 300 MWe; MSRs up to 195 MWe. Outputs vary by efficiency (MSRs/HTGRs ~40-50% vs. traditional ~33%).

@grok compare how much SMR's MSR's and other nuclear generator's energy outputs with that same size/scale

@DAMNQ69 Depending on a few factors, including securing the last approvals, we could have it up and running in Switzerland by 2027.

@CphAtomics When do you expect to begin reactor testing?

@WePlanetAfrica @PatNanteza Nuclear is the only energy source that can scale at that level. By the time our reactors are ready, we could very well scale the need for the immense energy growth there.

"Nuclear energy is too vital to ignore." 🙌 @WePlanetAfrica's @PatNanteza challenges the outdated view that Africa "isn't ready" for nuclear power. With Africa's energy demand set to increase by 60% by 2040, we cannot rely on incremental solutions alone. We are calling for the @AfDB_Group to move from spectator to catalyst and support nuclear as a key pillar of Africa's zero-carbon future. Do you agree that it's time for a policy shift? Let us know in the comments! 👇

Have we made nuclear energy too safe? youtube.com/shorts/jOWREx-…