Fusion Energy Is Still Theoretical. Japan Wants To Commercialise It Anyway.

Even if commercial reactors remain years away, the fusion race is already reshaping capital flows, research priorities and geopolitical alliances. Japan’s approach suggests that the payoff from fusion may begin long before the first power plant connects to the grid. The infrastructure, manufacturing expertise and global partnerships being built today could determine who dominates tomorrow’s energy economy

In a cavernous facility north of Tokyo, inside a steel chamber shaped like a hollow ring, scientists are attempting to recreate the reaction that powers the sun.

The machine does not burn coal or gas. Instead, it confines plasma heated to temperatures hotter than the core of a star, using powerful magnetic fields to hold the searing material in place. If the experiment succeeds, it could unlock a form of energy long described as physics’ ultimate prize: clean, safe and virtually limitless.

For decades, nuclear fusion has hovered just beyond reach, always promising and never quite arriving. Now Japan is trying to change that, betting that mastery of fusion will not only secure its own energy future but also reshape global markets and industrial supply chains.

Under a national Fusion Energy Innovation Strategy, Japan is mobilizing its advanced manufacturing base, research institutions and industrial giants to demonstrate that electricity from fusion can be generated by the 2030s. The goal is ambitious. The implications, if realized, could be enormous.

Commercial fusion could strengthen Japan’s long-term energy security, sharpen its industrial competitiveness and accelerate decarbonization. For a country with limited domestic energy resources and a long history of dependence on imports, the stakes are unusually high.

“Japan’s strategy has changed to emphasise helping private commercial activity, stimulated and supported by public policy,” said Satoshi Konishi, cofounder and chief executive of Kyoto Fusioneering, a startup focused on developing and commercializing fusion technologies and power plants. “We’re making good progress, especially with the government’s quick launch of the cabinet office’s initiatives to industrialise fusion.”

The economic case has gained new urgency. A 2024 study by the MIT Energy Initiative estimated that fusion energy could add between $3.6 trillion and $8.7 trillion in global value, depending on construction costs, by lowering decarbonization expenses and boosting economic output.

Building on decades of research

Japan’s strategy rests on decades of investment in fusion science. A centerpiece of that effort is JT-60SA, one of the largest and most advanced tokamaks in the world. The doughnut-shaped device, located in Naka about two hours from Tokyo, confines and heats plasma using massive electromagnetic coils, enabling controlled fusion reactions.

JT-60SA was developed jointly by Japan and the European Union as a “satellite tokamak” to support ITER, the global intergovernmental fusion project under construction in France. The facility also incorporates contributions from American firms such as General Atomics and research institutions including Princeton Plasma Physics Laboratory.

“We’re developing fusion technologies and plasma scenarios aimed at realising fusion energy and fostering the human resources needed for future reactors,” said Koji Takahashi, project manager of the JT-60SA project at the National Institutes for Quantum Science and Technology, which is responsible for operating and upgrading the machine.

The tokamak serves as a testbed for critical technologies. Canon Electron Tubes & Devices has developed a high-output, multi-frequency gyrotron to heat plasma in both JT-60SA and ITER. Diagnostic systems from General Atomics have been integrated to measure the behavior of high-energy particles in fusion plasmas, knowledge considered vital to improving the commercial prospects of next-generation reactors.

While JT-60SA explores plasma physics at scale in support of ITER, another initiative known as FAST, or Fusion by Advanced Superconducting Tokamak, focuses on integrating and testing the components needed for commercial power plants.

“FAST is a small tokamak facility where we can test components in a real fusion-relevant environment,” Mr. Konishi said. His firm supplies the integrated plant with key components, including fuel and thermal cycle systems.

FAST is intended to demonstrate Japan’s ability to align research, engineering and commercial objectives along a credible path toward fusion power generation by the 2030s.

Partnerships across borders

Japan’s fusion ambitions extend beyond its own borders. The country has deepened collaboration through agreements such as the 2025 United States-Japan Technology Prosperity Deal, which covers supply chains for magnets and other high-power components, and a 2024 strategic partnership between Japan’s Ministry of Education, Culture, Sports, Science and Technology and the U.S. Department of Energy aimed at accelerating demonstration and commercialization.

A memorandum between Japan and the United Kingdom promotes information exchange, talent development and industrial collaboration.

By combining global partnerships with strategic investments in domestic manufacturing, Japan is seeking to position itself as a key node in emerging fusion supply chains.

“We’re organising the supply chain for the fusion energy system by connecting many companies and acting as a catalyst,” Mr. Konishi said.

Established industrial companies remain central. Hitachi provides components to ITER and oversaw much of the construction of the Large Helical Device, a major experimental fusion reactor project. Mitsubishi Heavy Industries and Sumitomo Electric contribute expertise in magnets, cryogenics and advanced materials.

Startups and spin-offs

Alongside legacy manufacturers, a new generation of startups is pushing alternative approaches.

EX-Fusion, originating from Osaka University’s Institute of Laser Engineering, is working to develop a laser-powered commercial fusion reactor. Helical Fusion is designing stellarator reactors aimed at steady-state power generation, while Linea Innovations is pursuing hydrogen-boron reactions intended to reduce radioactive waste compared with conventional fusion methods.

“One of the advantages of being a spin-off from a university is the research infrastructure that most in the private sector can’t afford, but which we’re able to access,” Mr. Konishi said, noting that access to specialized facilities and materials allows longer-term experimentation.

Akio Sagara, professor emeritus at Japan’s National Institute for Fusion Science, described a complementary division of labor. “Research institutes are primarily funded by taxpayers, so they aren’t always flexible enough to accept the risks of new techniques or equipment,” he said. Startups, he added, can make riskier moves that lead to breakthroughs, which are later industrialized by larger companies.

As projects move from prototype reactors toward potential commercial units, funding models are evolving.

“As we move from prototype reactors to the first commercial units, it makes sense for there to be the division of roles and collaboration between publicly funded research institutions and private capital,” Professor Sagara said.

Japanese fusion startups have drawn venture capital backing from major funds, reflecting growing investor interest in the sector. Globally, private investment in fusion reached about $15 billion by September 2025, according to Fusion for Energy, more than eight times the amount reported in 2020.

Beyond electricity

Advocates argue that fusion’s impact could extend beyond power generation.

“We expect the outcomes from the fusion technology developments in JT-60SA and ITER to not only result in the commercialisation of fusion but also contribute to the development of spin-off technologies, such as super conducting materials, AI applications, hydrogen production and the like,” Mr. Takahashi said.

Those spillovers could include advances in materials science, robotics and even space exploration. Partnerships exploring liquid metal technologies, for example, may inform the development of liquid metal mirrors for deep space missions.

At its most ambitious, fusion promises more than clean electricity. Supporters envision a future of energy independence, industrial renewal and scientific collaboration across borders.

Whether fusion can fulfill those expectations remains uncertain. The technical hurdles are immense, and commercial viability has yet to be demonstrated. But by weaving together government policy, industrial capacity, research institutions and venture capital, Japan is positioning itself as a central player in the race to harness the energy of the stars.

If fusion’s long-awaited breakthrough finally arrives, Japan intends to be not only a beneficiary, but a supplier of the machines, materials and expertise that make it possible.

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