Two competing approaches to nuclear power are emerging as artificial intelligence data centers desperately seek reliable, long-term energy solutions. GE Vernova, an established industrial giant, is betting on water-cooled small modular reactors (SMRs) that use conventional low-enriched uranium fuel. Meanwhile, X-Energy, a newer player that went public in April 2026, is pursuing a riskier but potentially more versatile helium-cooled design that could unlock industrial applications far beyond electricity generation.

The competition matters because AI's power appetite is reshaping the entire energy sector. Data center operators are rushing to secure power wherever they can find it, creating unprecedented demand for both bridge solutions and long-term nuclear capacity. This urgency has thrust energy stocks into the spotlight and forced technology companies to think seriously about their power infrastructure for the first time.

What Makes These Two Reactor Designs So Different?

GE Vernova's approach centers on the BWRX-300, a boiling-water nuclear reactor developed in partnership with Hitachi. This design uses water for cooling and relies on low-enriched uranium (LEU), the same fuel type used in traditional large nuclear reactors. The company has already built substantial momentum in the energy market, with 116 gigawatts of capacity under contract and a backlog worth $176 billion, much of it driven by demand for natural gas turbines from utilities and data center operators.

X-Energy's Xe-100 takes a fundamentally different path. Instead of water, it uses helium gas for cooling, which allows the reactor to reach temperatures up to 750 degrees Celsius. This thermal capability opens doors that traditional reactors cannot. The higher heat output makes the Xe-100 useful for industrial processes such as hydrogen production, chemical manufacturing, and desalination, not just electricity generation.

The fuel difference is equally significant. X-Energy uses tri-structural isotropic (TRISO) pebbles, which the U.S. Department of Energy has called "the most robust nuclear fuel on Earth." These pebbles are designed to withstand extreme conditions and resist failure in ways that conventional fuel cannot.

How Do These Reactors Address AI's Energy Crisis?

The nuclear industry is responding to AI's explosive power demands by developing smaller, more flexible reactors that can be deployed incrementally rather than requiring massive upfront infrastructure investments. SMRs promise to make nuclear energy modular, scalable, and safer than traditional large nuclear power plants, addressing concerns that have limited nuclear expansion for decades.

However, the timeline and maturity of these companies differ dramatically. GE Vernova is a mature megacap industrial leader with a market capitalization of $255 billion and immediate revenue streams from gas turbines. For conservative investors seeking exposure to companies that can meet AI power demands today while building nuclear capacity for the 2030s, GE Vernova offers a lower-risk profile.

X-Energy, by contrast, is still in very early stages. The company aims to complete construction and installation at its TX-1 fuel facility in 2027 and begin commercial fuel fabrication by 2028. It is targeting the 2030s for deploying its Xe-100 SMRs to customers including Dow Chemical and Amazon. With a market capitalization of $6.1 billion, X-Energy is a highly speculative, volatile small-cap stock with more to prove over the next few years, but it also offers more explosive upside potential if it succeeds.

Why Is Fuel Supply Becoming a Bottleneck?

The race to deploy SMRs is hitting an unexpected constraint: the availability of specialized nuclear fuel. Many advanced reactor designs, including X-Energy's Xe-100, depend on high-assay low-enriched uranium (HALEU), a fuel type that contains more uranium-235 than standard reactor fuel while remaining below the threshold for highly enriched uranium. HALEU allows SMRs to produce more power from less fuel, run longer between refueling, and fit into smaller, more flexible designs.

The problem is acute. The U.S. Department of Energy estimates that domestic demand for HALEU could reach 50 metric tons per year by 2035. Today, less than 1 metric ton of HALEU is produced in the United States annually. This supply gap could become the limiting factor in whether the SMR market can scale to meet AI's energy needs.

Recognizing this bottleneck, the federal government has launched initiatives to accelerate domestic fuel production. Nusano, a physics company based in West Valley City, Utah, was recently selected by the National Reactor Innovation Center (NRIC) and the U.S. Department of Energy to develop its direct metallization HALEU nuclear fuel production line as part of the Nuclear Energy Launch Pad Program, a federal initiative designed to accelerate innovative nuclear technologies from concept to commercial deployment.

How Does Nusano's Fuel Production Technology Work?

Nusano's approach to HALEU production differs fundamentally from the gas centrifuge method that has dominated uranium enrichment for decades. Instead of using uranium hexafluoride gas spun through connected centrifuges, Nusano's direct metallization process converts uranium to metal before enrichment, then applies proprietary separation techniques to separate atoms by mass. This pathway eliminates hazardous fluorine chemistry and simplifies the production process significantly.

The benefits of this approach include several practical advantages:

• Simplicity: Eliminates the uranium hexafluoride conversion, deconversion, and metallization steps required in traditional gas centrifuge production, reducing complexity and potential failure points.
• Speed: Achieves full enrichment from natural uranium to 19.75% enriched material in a single-pass enrichment process, rather than requiring multiple passes through centrifuges.
• Efficiency: Delivers a high feed-to-product ratio that enables high-volume HALEU production without requiring massive facilities.

Nusano's HALEU production line is designed to be remarkably compact. Each unit requires just 1,200 square feet of operating space and is expected to produce 5.9 metric tons of HALEU per year, with the first unit scheduled to be operational in 2031. This modularity allows additional units to be deployed incrementally as market demand grows, mirroring the same scalability philosophy that makes SMRs attractive.

"Selection for Launch Pad signals Nusano's HALEU technology and team are ready to move forward," said Keith Titus, CEO of Nusano. "The review process considered each project's technical merit, operational readiness, and alignment with national strategic priorities. We're proud to be included and grateful for the opportunity to advance work to support America's energy independence."

Keith Titus, CEO of Nusano

What Role Is Fusion Playing in This Energy Transition?

While fission-based SMRs are advancing rapidly, fusion energy is also progressing from decades of theoretical research toward practical demonstration. Fusion, which generates energy when the atomic nuclei of light elements such as hydrogen isotopes fuse based on the same principle that powers the sun, is entering a phase of active pursuit toward practical application.

The International Thermonuclear Experimental Reactor (ITER), an international project involving Japan, China, the European Union, India, Korea, Russia, and the United States, is under construction to demonstrate the scientific and technological feasibility of fusion power. Simultaneously, government-led research and development initiatives and private-sector investment are expanding rapidly.

Hitachi, the Japanese industrial conglomerate, has been involved in fusion development since the 1950s and is contributing key equipment to ITER and other fusion research facilities. The company's expertise spans electromagnets, vacuum vessels, neutral beam injection systems, and the integration of technologies including ultra-high voltage, superconductivity, cryogenics, ultra-high vacuum, materials science, and thermal design.

Fusion technology has advanced from the "physics research phase" focused on demonstrating plasma principles to the "engineering phase" aimed at demonstrating practical power generation. The next stage coming into view is the extraction of fusion energy and its conversion into electricity, though many challenges remain before reaching this milestone, including maintaining plasma stability over extended periods and efficiently converting generated heat into electricity.

What Does This Mean for AI's Long-Term Energy Strategy?

The convergence of SMR development, fuel supply initiatives, and fusion research suggests that the technology industry is pursuing a diversified nuclear strategy rather than betting on a single solution. Near-term, GE Vernova's proven water-cooled reactors and natural gas turbines will likely dominate, providing bridge power while SMRs mature. Medium-term, X-Energy's helium-cooled design and other advanced SMRs could unlock industrial applications that pure electricity generation cannot serve. Long-term, fusion energy could provide virtually unlimited clean power, though commercial deployment remains years away.

The critical variable is whether domestic fuel supply can keep pace with reactor deployment. If Nusano and other HALEU producers can scale production to meet the Department of Energy's 50 metric ton per year estimate by 2035, the SMR market could accelerate dramatically. If fuel remains scarce, even the most advanced reactor designs will sit idle.

For AI companies and data center operators, this energy transition represents both opportunity and risk. Companies that secure long-term nuclear power contracts early may gain competitive advantages in operating costs and carbon footprint. Those that delay may find themselves competing for limited capacity in a market where energy has become as strategically important as computing power itself.