Everything is made of atoms. So we built @AaloAtomics new digital world from them. The website pulls you into Aalo’s world, where images break into particles and the perspective shifts between planetary and atomic scales. Warm light gives the science a physical, human presence. Brand identity, art direction, website, and investor deck: done!
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> Go to Cursor/Codex
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Very excited to announce that at 12:20am on the 4th of July, Aalo achieved criticality on our first full-scale reactor.
We cut it close, but we pulled it off!!
Working towards this goal with such an incredible group of humans has been the most fulfilling period of my life. This moment has been three years in the making.
Last year, Executive Order 14301 called for at least three new reactors to go critical before July 4th, 2026.
As of late last Friday night, that goal has been surpassed!
When the EO was announced, we immediately sat down to figure out what the most ambitious scope would be, while still being potentially achievable by July 4th.
Some of the team proposed doing simplified designs with smaller fuel loads, or building in existing facilities.
One thing was clear: We wouldn't have time to integrate a full-scale sodium heat-removal loop to bring the reactor to its full 30 MWt.
So here’s where we landed:
➡️ We purchased the entire commercial-scale fuel load. This is enough fuel to operate at 30 MWt / 10 MWe for 3 years before refueling. To my knowledge, it’s the largest fuel load that’s been taken critical in the DOE pilot program, by far.
➡️ We built a full-scale reactor vessel in our factory, and loaded in our commercial graphite layout. All the dimensions, vessel thickness, and manufacturing techniques are essentially the same as we will use for the imminent commercial version. There will be a few minor tweaks for sodium flow and full-power, but nothing major.
➡️ We built an entirely new reactor facility at the Idaho National Lab. Building a building is easy. Building a new reactor facility comes with a mountain of paperwork, policies, operation and training procedures, security, instrumentation and control, and more.
Zero-power criticality might seem like a small step, but I can tell you, going through the exercise of building a reactor and taking it to criticality has been extremely valuable.
The learnings on regulatory, ops, manufacturing, supply chain, QA, economics, engineering, and design will accelerate our path through to the final iteration at full-power.
America is blessed to have a recent Cambrian explosion of startups in nuclear, all going after different markets, technologies, and strategies.
I’m excited that sodium, gas, salt, and new PWRs are all getting pushed forward once again. The best outcome for humanity is to have all these advance in parallel, as quickly as possible, while maintaining safety.
Thanks again to our amazing team, DOE, INL, BEA, and everyone else who helped us get to where we are today.
This could not have happened anywhere else. Happy birthday, America!! 🇺🇸🇺🇸🇺🇸
There has never been a better time for nuclear energy. The Second Atomic Age has begun, and this one will be here to stay.
⚛️🇺🇸 19 minutes after America turned 250, a reactor quietly went critical in the Idaho desert.
Full story in my Substack (link in 1st reply). Main points 👇
1️⃣ July 4th, 12:19am: Aalo's Critical Test Reactor reached criticality at Idaho National Lab — the 4th US company to bring an advanced reactor critical in ~30 days under the DOE's EO 14301 testing push.
2️⃣ I contend Aalo's is the most COMMERCIALLY important of the four. It's the only one built at full commercial scale — not a tabletop test article.
3️⃣ And it did it alone. The others reached criticality on borrowed test infrastructure, leaning on existing facilities, procedures, and staff. Aalo built its own facility, wrote its own procedures, and loaded its own fuel with its own crew. A dress rehearsal for a real business — not a science experiment.
4️⃣ Its killer feature is boring: Aalo runs on standard ~5% LEU uranium, the same fuel chain as today's reactors. Rivals need scarce HALEU/TRISO fuel that doesn't exist at commercial scale yet. Fuel supply is the sector's most underpriced bottleneck.
5️⃣ Criticality ≠ electricity. Zero-power criticality just proves the physics. The real catalyst is 2027, when Aalo-X makes FULL-POWER electricity — enough to run a data center.
6️⃣ The thesis — the "Nuclear Henry Ford Moment": mass-produce reactors on robotic, automotive-style lines and nuclear beats coal & gas on price. AI data centers are the on-ramp, not the destination.
7️⃣ The market has the timeline backwards. A new AP1000 takes ~15 years. Aalo is ~3 years from mass production. Order Pods in 2028 → online 2031, five years before a plant you break ground on today — and each one rolls off cheaper than the last.
8️⃣ The setup rhymes with Amazon in 1997. Critics called that IPO "obviously overvalued." $1,000 in it then ≈ $3.2M today. Aalo's Series C is ~10x its last round — and it's the one advanced-nuclear name no hyperscaler has claimed yet.
🔑 Founding to fission in under 3 years. Reactor building erected in 36 days. The team is so mission-obsessed they were OFFENDED by a free week of paid time off.
Disclosure: I'm an early Aalo investor. My opinion, not investment advice.
@MattLoszak@AaloAtomics $OKLO #nuclear
Bull case, or hopium? Tell me where I'm wrong 👇
We’ve gone critical.
At 12:20 am on July 4th, Aalo sustained a controlled fission chain reaction for the first time. We have officially surpassed the goal of President Trump’s Executive Order 14301, achieving 4 advanced nuclear reactor criticalities by America’s 250th birthday.
This is a zero-power criticality to validate our supply chain, reactor physics and control systems for our 10 MWe full-powered reactor, the Aalo-X, targeting power operations next year.
Everything was built at full scale: fuel, moderator, control systems, etc., so we understand system performance at its commercial scope.
That also meant tackling four of the most difficult things in nuclear with this criticality milestone:
✅ Ground-up construction of our reactor facility
✅ Manufacturing the reactor in our factory and shipping them by road
✅ Assembling our own fuel assemblies using commercial UO2
✅ Standing up training, safety, and operational programs to become our own nuclear operator
I am proud to say we have accomplished all four goals, along with achieving criticality.
The reactor building was constructed in 36 days and construction to criticality was achieved in under 8 months. That’s the fastest nuclear build in the last 80 years.
A massive congratulations to the Aalo Atomics team and our partners. Many thanks to Idaho National Laboratory, the DOE-Idaho Operations Office, and the Office of Nuclear Energy for their immense support in enabling this milestone and dedicated to the American nuclear resurgence.