The Helium Solution: Can Small Nuclear Reactors Power the AI Boom?

When we envision the transition to clean energy, the picture is usually dominated by vast solar farms and towering wind turbines. But for the world’s most power-hungry operations—ranging from heavy industrial manufacturing to the massive data centers training tomorrow’s artificial intelligence—intermittent electricity simply isn't enough. They require intense, reliable heat and uninterrupted 24/7 power.

Enter X-energy, a Maryland-based company reviving a concept originally pitched during the World War II Manhattan Project: helium-cooled nuclear reactors.

Traditional nuclear power plants use liquid water for cooling. While effective, water cooling caps the maximum operating temperature of a reactor, leaving it hundreds of degrees too cool for industrial processes that currently burn fossil fuels to make concrete, steel, and plastics. X-energy’s proposed Xe-100 small modular reactor (SMR) swaps water for helium gas. This allows the system to operate at much lower pressures while reaching significantly higher temperatures, generating super-heated steam.

Rather than conventional fuel rods, the Xe-100 uses TRISO (tristructural-isotropic) "pebbles." These compact, uranium-based spheres are highly resistant to melting and corrosion. They are continuously fed into the top of the reactor and flow to the bottom. According to the company, the design is intrinsically safe: if power is lost and temperatures spike, the nuclear reaction naturally slows down and stops on its own.

This unique combination of high heat, smaller footprint, and enhanced safety is attracting major corporate players. Because the Xe-100 generates about 80 megawatts of electricity—roughly one-tenth the capacity of a standard nuclear plant—up to 12 units can be clustered together and co-located directly where the power is needed. This eliminates the need for massive new transmission infrastructure. Chemical giant Dow is currently working through regulatory hurdles to use an Xe-100 to supply heat and power to a Texas facility by the early 2030s.

Simultaneously, the tech industry is taking notice. With US data center electricity consumption expected to double by 2030 driven by the AI boom, tech giants are desperate for stable, carbon-free base load power. Amazon is collaborating with X-energy on a 320 MW cluster of four reactors in Washington state, also targeting the 2030s.

Yet, the path to a nuclear-powered industrial and AI renaissance is fraught with significant hurdles. The economic viability of SMRs remains largely unproven. The US Energy Information Administration estimates that electricity from SMRs will cost more than six times that of solar power. Furthermore, while TRISO fuel is excellent for nonproliferation—the tough spheres are exceptionally difficult to weaponize—the Xe-100 could produce up to 10 times the volume of spent nuclear fuel per unit of energy compared to existing reactors, even if this lower-level waste requires less sophisticated storage.

As artificial intelligence pushes our energy grids to their limits, small modular reactors offer a fascinating, albeit expensive, glimpse into the future of infrastructure. The ultimate question is not just how smart AI can become, but whether we can afford the economic and environmental costs of keeping it powered.

Key Points

• X-energy is developing SMRs that use helium gas instead of water, allowing for higher temperatures and lower operating pressures.
• The reactors use TRISO fuel pebbles, which are highly resistant to melting and are designed to safely stop reacting if power is lost.
• Amazon and Dow are partnering with X-energy to deploy these reactors for data centers and heavy industrial heating by the 2030s.
• Significant caveats remain: SMR electricity could cost over six times more than solar, and the reactors produce a higher volume of spent fuel.

Why It Matters

As AI data centers and heavy industries search for reliable, carbon-free power, helium-cooled SMRs offer a promising technological leap, provided they can overcome steep economic and waste-management hurdles.

Sources:

• X-energy and its helium-cooled nuclear reactors — MIT Technology Review - AI