Your morning cold plunge may soon be powered by a tiny nuclear reactor. The first small modular reactor has reached criticality, promising clean, stable energy for biohacking labs and longevity clinics.
The Science
The Antares startup announced Thursday that its test reactor at Idaho National Laboratory achieved criticality, making it the first new design to cross this threshold. Criticality means the nuclear reactions inside became self-sustaining; it does not mean the reactor started generating power. This milestone follows an executive order that directed the Department of Energy to have three different reactor designs reach criticality in just over a year.
Antares bases its design on a new fuel system called TRISO, which shifts complexity and safety from the reactor to the fuel itself. The fuel consists of tiny pellets with a uranium oxide core, surrounded by several carbon layers that moderate neutron and light nuclei energy. A hard ceramic shell encases everything, designed to withstand the highest temperatures the uranium can produce. This inherently safe design drastically reduces the risk of core meltdown, as the fuel particles can withstand temperatures up to 1,600 °C without degrading. In contrast, conventional reactors require active cooling systems and multiple containment barriers to prevent accidents. TRISO fuel, on the other hand, acts as its own containment, simplifying reactor engineering and allowing operation with fewer moving parts and passive safety systems. The fuel pellets are about the size of poppy seeds, and each one is a miniature reactor in itself, capable of retaining fission products even under extreme conditions.
“This modular reactor promises clean, stable power—a critical resource for longevity research and biohacking therapies.”
Key Findings
- First modular reactor to reach criticality: Antares is the first new design to achieve a self-sustaining nuclear reaction in the U.S., a crucial step toward commercialization. This achievement paves the way for other designs to follow and accelerates the race to bring modular nuclear power to market.
- TRISO fuel system: This fuel encapsulates uranium in multiple carbon and ceramic layers, increasing safety and reducing reactor complexity. Each TRISO particle is essentially a miniature reactor, capable of retaining fission products even under extreme conditions, such as loss of coolant.
- Accelerated timeline: The executive order sought three designs to reach criticality in just over a year; Antares hit that milestone within the window. This pace reflects renewed government interest in nuclear energy as a climate and energy security solution.
- No power generation yet: Criticality does not mean electricity production; the reactor still needs to be connected to a turbine or energy conversion system. Antares is expected to complete grid connection in the coming months, at which point it can supply continuous electricity.
Why It Matters
For biohackers and longevity enthusiasts, modular nuclear power represents a constant, carbon-free electricity source ideal for research centers, cryotherapy clinics, cold therapy facilities, or even smart homes. Energy stability is a limiting factor in many health technologies—from supplement production to continuous glucose monitors. A modular reactor could provide 24/7 power without relying on fossil fuels or renewable intermittency. Moreover, nuclear power emits no CO2 during operation, making it an attractive option for those looking to reduce their carbon footprint without sacrificing reliability.
Moreover, the TRISO design reduces accident risk, making it feasible to install these reactors near communities. This opens the door for longevity clinics or biohacking hubs to have their own power source, cutting costs and increasing autonomy. For example, a cryotherapy center that requires extremely low temperatures consistently could benefit from uninterrupted power supply, avoiding outages that could ruin expensive treatments. Similarly, research labs studying the effects of cold on longevity could operate with complete independence from the grid. The ability to generate power on-site also eliminates transmission losses and provides protection against grid failures, which are becoming more frequent due to extreme weather events linked to climate change.
Your Protocol
Though modular reactors aren't commercially available yet, you can start preparing for this energy revolution:
- 1Educate yourself on small modular reactors: Follow Antares and other startups like NuScale, X-energy, and TerraPower. Small nuclear power could be as disruptive as solar panels. Subscribe to clean energy newsletters and attend webinars on the topic. Understanding the technology and regulatory landscape will help you make informed decisions when these reactors become available.
- 2Assess your energy needs: If you're a biohacker with a home lab or a clinic, calculate your power requirements. Modular reactors typically range from 10 to 300 MW, ideal for medium-sized facilities. Use a power meter to determine your peak demand and consider whether a modular reactor could cover it. For instance, a longevity clinic with MRI machines, cryochambers, and data servers might require several hundred kilowatts, a load that a small modular reactor can easily handle. Also consider future expansion: if you plan to add more equipment, choose a reactor with scalable capacity.
- 3Consider location: These reactors are designed for near-community installation. If planning a longevity center, research local nuclear regulations. Some countries are already updating their legal frameworks to allow modular reactors in residential or industrial zones. Consult with local authorities and nuclear engineering firms to understand licensing and safety requirements. Also evaluate site-specific factors such as seismic activity, water availability for cooling, and proximity to population centers. Early engagement with regulators can streamline the approval process.
What To Watch Next
Antares and other startups must now demonstrate safe and efficient electricity generation. Grid connection tests are expected in the coming months. The U.S. Department of Energy may also accelerate permits for commercial installations. Additionally, watch the development of the TRISO fuel supply chain, as scaling up production will be key to economic viability. Currently, TRISO fuel is produced in limited quantities; commercial deployment will require new manufacturing facilities and quality control processes.
Also watch for other modular reactor designs using different technologies, such as molten salt or fast neutron reactors. Competition could lower costs and speed adoption. For example, molten salt reactors operate at atmospheric pressure, simplifying safety further, while fast neutron reactors can burn existing nuclear waste, addressing the waste problem. Each technology has its own advantages and challenges, and diversity of approaches will increase options for consumers. Keep an eye on international developments as well: countries like Canada, the UK, and Japan are also investing in small modular reactors, which could create a global market and drive down costs through economies of scale.
The Bottom Line
The first small modular nuclear reactor has achieved criticality, a key step toward clean, stable, safe power. For longevity seekers and biohackers, this means potential energy independence and another tool for health optimization. The future of nuclear is small, modular, and promising.
Stay tuned: the power fueling your next longevity protocol might come from a reactor the size of a shipping container.
