Helium-Cooled Nuclear Reactors Could Power Heavy Industry
Heavy industry needs more than electricity—it needs raw, scorching heat to make concrete, steel, glass, plastics, and chemicals. Solar panels and wind turbines can't deliver that kind of thermal punch, and traditional nuclear reactors simply don't get hot enough. X-energy thinks helium-cooled small modular reactors are the answer, and the company is betting that co-locating them at factories and data centers could shrink some of the world's biggest carbon footprints.
Why Helium Changes the Nuclear Game
Traditional reactors use liquid water as a coolant, which caps their operating temperatures hundreds of degrees below what industrial processes require. X-energy's proposed Xe-100 reactor swaps water for helium gas, allowing it to run at much lower pressures and higher temperatures. The helium heats water into super-heated steam that industry can use directly, or to spin a turbine generating 80 megawatts of electricity, or both. That's about one-tenth the capacity of most reactors operating today. The reactor uses TRISO fuel—compact uranium-based pebbles that are extremely resistant to corrosion and melting—added continuously at the top and flowing slowly to the bottom. X-energy says the design is intrinsically safe: if temperatures rise during a power loss, the nuclear reaction naturally slows and stops.
The Industrial Heat Opportunity
Industrial heating accounts for 18 percent of annual global greenhouse-gas emissions, with roughly half coming from high-temperature processes that are hard to electrify. Co-locating small nuclear reactors at large manufacturing facilities could dramatically cut those emissions. The Xe-100 could also serve the fossil fuel industry, which currently burns vast quantities of natural gas to recover oil from tar sands and during refining. And because the reactor scales down in size and power from today's gigawatt-scale plants, it can serve more markets—even individual data centers. AI and data centers are now the single largest component of new US electricity demand, expected to double again by 2030. X-energy says up to 12 reactors could be clustered to provide 24/7 on-site power at lower cost than a traditional nuclear station, without new transmission infrastructure.
The Hard Part: Economics and Waste
Helium-cooled fission is well understood, but the only commercial-scale power generation of this type today is in China, where two reactors have struggled to operate continuously. X-energy says its vertically integrated fuel supply should ensure reliable operation, with reactors lasting 60 years. Yet the economic case for small modular reactors remains largely unproven. Nuclear costs and timelines have a habit of ballooning, and the US Energy Information Administration calculates that electricity from SMRs will cost more than six times that from solar farms. While the current US regulatory and funding environment favors nuclear, that could shift over X-energy's long development timeline. TRISO reactors look excellent for safety and nonproliferation—the tough spheres would be difficult to turn into weapons—but less impressive on waste. The Xe-100 might produce 10 times the volume of spent nuclear fuel per unit of energy as existing reactors, though its lower-level waste will need less sophisticated storage.
What's Next for X-energy
The US Nuclear Regulatory Commission has issued X-energy's subsidiary a fuel fabrication license for TRISO-X pebbles, with its first factory due for completion in 2028. An Xe-100 to supply heat and power for a large chemical facility in Texas operated by Dow has cleared its first regulatory hurdle and could be operational by the early 2030s. In tandem, X-energy is working toward a 320 MW cluster of four Xe-100 reactors in Richland, Washington, in collaboration with Amazon, and a larger 6 GW fleet in the UK's northeast. Both projects target electricity generation in the 2030s. The company's bet is that flexible, high-temperature nuclear can serve markets that renewables and traditional reactors cannot reach.
Key Takeaways
- X-energy's Xe-100 reactor uses helium gas as a coolant, enabling higher temperatures and lower pressures than water-cooled reactors.
- Industrial heating accounts for 18% of global greenhouse-gas emissions, with half from hard-to-electrify high-temperature processes.
- The Xe-100 could produce 80 MW of electricity or super-heated steam for industry, and up to 12 reactors can be clustered for 24/7 power.
- SMR electricity is projected to cost more than six times that from solar farms, according to the US Energy Information Administration.
- X-energy has a fuel fabrication license for TRISO-X pebbles, with a Dow chemical facility in Texas potentially operational by the early 2030s.
Source: MIT Tech Review • 🇺🇸 San Francisco
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