Building the most power dense energy generator.

Cambridge, MA
As we wrapped up a busy #NYCClimateWeek, we stopped by the New York Stock Exchange today to talk about @ApolloAtomics and share our vision of a clean and reliable energy future powered by nuclear, checkout the full interview below ⚛️ piped.video/tfg7yrf7bIk?si=nh2r… Special thanks to @bjbaumann2014, @Furrier, @theCUBE, @GemmaAllenSays, @dvellante
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Today, we are announcing our $31M seed financing at Apollo Atomics. The $26M equity is led by FCVC with participation from Y Combinator, TeleSoft Partners, Alumni Ventures, Pelion Venture Partners, Duke Capital Partners, Robinhood Ventures, and Nucleation Capital. $5M of equipment financing is provided by Oak Ridge Financial. Apollo Atomics is the only nuclear company that can deliver high power output nuclear reactors (>80 MW) on a truck. The higher power density is the strongest argument for cost effectiveness and mass manufacturing in the nuclear industry today. We achieve this without relying on exotic/scarce fuel, unqualified materials, or high regulatory uncertainty. Achieving that goal is a mirage if you don’t build the right company. With Drew Walker, we have assembled an extremely talent dense team with Excellence, Intensity, and Execution at its core. We are running a low power reactor demonstrator within MIT and now building a full scale 1 MW reactor prototype under commercial reactor conditions. We work directly with the U.S. Nuclear Regulatory Commission to support a commercial deployment in 2028. Apollo Atomics is not hardware in vacuum, we are building software solutions for autonomous reactor control, licensing support, and reactor modeling to reduce OpEx and deployment timeline. Deeply grateful to our early investors for supporting our mission when no one else believed particularly Genesis Fund, Arjun Gupta, and New Era Ventures, to our early supporters within Massachusetts Institute of Technology, MIT Sandbox Innovation Fund Program, TNT, MIT Department of Nuclear Science and Engineering. Excited to have many brilliant individual investors supporting our mission including Paul Graham, Evan Meagher, CFA, Philip Johnston, Ray Rothrock, Matteo Franceschetti
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Great to be on @nihalkurth show, check it out below 📺
NEW episode:: @ApolloAtomics founder & ceo @AssilHalimi Building the most compact nuclear reactors. Energy abundance soon to be unlocked. piped.video/watch?v=CcZkSzbj…
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Such a pleasure to meet with @paulg today in his legendary house in Palo Alto! I was impressed by how much he knows about nuclear technology, particularly breeder reactors! ⚛️ @ycombinator @drewWal43470101
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Assil Halimi retweeted
@ApolloAtomics is joining the AI for Nuclear Energy Consortium to help bring advanced artificial intelligence into the design, licensing, manufacturing, and operation of the next generation of nuclear systems. Led by @INL and established under the @ENERGY Genesis Mission, the consortium brings together national laboratories, universities, nuclear companies, and technology leaders such as @nvidia and @Microsoft. For Apollo, this work aligns directly with our mission: combining advanced engineering, modern manufacturing, and digital tools to make nuclear energy faster to deploy, more scalable, and more cost-effective.
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I just got an investor update from a nuclear reactor startup that measures their LOIs in gigawatts. That's a new one.
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Honored to receive the Del Favero Thesis Prize at the Massachusetts Institute of Technology for the most innovative advance in the field of Nuclear Engineering ⚛️ My deepest gratitude goes to Professor Koroush Shirvan for his exceptional mentorship. I would also like to thank John Parsons and Jacopo Buongiorno for serving on my thesis committee, as well as all the NSE staff and faculty who made my time at MIT one of the most personally enriching and intellectually stimulating periods of my life. I would also like to express my appreciation to Benoit Forget and James Del Favero for this recognition. Now, it's time to build 🚀
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Excited to see this at the Garden State📍NJ
Gov. @MikieSherrill: In April I ended New Jersey's 50-year moratorium on new nuclear power. Today we're taking another step forward. I'm signing the Power New Jersey Act to launch the next generation of nuclear energy in our state. This bill creates a competitive process to build new nuclear projects that can power hundreds of thousands of homes. Ratepayers won't pay a dime until the project is built, and they'll never be on the hook for construction cost overruns.
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Sam Altman deserves credit for YC's turn toward hard tech. When he became CEO in 2014 he went out and recruited companies doing stuff like airliners and fusion, and hard tech startups have been some of the best in every batch since.
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Assil Halimi retweeted
I turned up at the YC office this morning to find @ApolloAtomics installing the primary loop autoclave for their nuclear reactor 😬 It’s the new component that means their SMRs will be 80% smaller than traditional designs.
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Assil Halimi retweeted
The nuclear reactor at YC Demo Day will be a sight to see, can't wait for you to see it
When Jessica and I spoke at YC last night there was a bright flash out behind the building. We were a bit nervous because there's a nuclear reactor startup in the batch that has a bunch of hardware back there. But apparently it was just a muni cable shorting out.
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Great to see @ApolloAtomics featured in Forbes! Thanks @dasha_shunina
Meet the most promising companies from the latest @ycombinator batch 👀 One big takeaway: AI agents need more than intelligence. They need memory, identity, observability, compliance, insurance and power. My latest @Forbes deep dive 👇 forbes.com/sites/dariashunin…
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Just made it to the YC office. Demo Day loading… ⚛️ @ycombinator @DrewWal43470101
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Modern nuclear. Factory-built. Rapidly deployed. 🚀
.@ApolloAtomics builds the most compact nuclear reactors with the highest uptime and a deployment time of less than 24 months. Apollo took the pressurized water reactor technology that already powers 80% of the world’s nuclear plants and flipped one part, the steam generator, to make the plant an order of magnitude smaller without compromising power. Congrats on the launch, @AssilHalimi & Drew! ycombinator.com/launches/QXj…
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Great to meet Sam today at @ycombinator offices, we talked about AI, energy infrastructure bottlenecks, LCOE, and the role of AI in nuclear deployment ⚛️
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Assil Halimi retweeted
We’re pleased to see this coordinated federal support framework for advancing nuclear power in space. At BWXT, we’re excited to be part of this momentum. Expanding America’s space nuclear capabilities is key to enabling national security missions and making a sustained presence on the Moon, Mars and beyond a reality. Learn more about our work in space nuclear systems at: bwxt.com/space
Today, we are releasing new guidance to Federal agencies for establishing a National Initiative for American Space Nuclear Power, as called for by President Trump’s EO on Ensuring American Space Superiority. Nuclear power in space will give us the sustained electricity, heating, and propulsion essential to a permanent presence on the Moon, Mars, and beyond. whitehouse.gov/wp-content/up…
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Great to be at @TAMU last week! I had the chance to tour their labs and get hosted by Professor Yassin Hassan and the Department of Nuclear Engineering to give a seminar on advanced nuclear and how Apollo Atomics, Inc. is building the next generation of reactors ⚡
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Assil Halimi retweeted
Thank you to @Framatome_ for sponsoring today’s @ANS_org TopFuel 2022 plenary! 👏🏽 It was a full house! Thanks also to our speakers from @Framatome_ (Ala Alzaben), @GovNuclear (Andy Griffith), @NCStateEngr (Alina Jugan), @mit_nse (@AssilHalimi), and @WECNuclear (Tarik Choho).
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