Nuclear fusion is no longer just a dream; it is already a business. While the world waits for "artificial suns" to power the future, Japan's Sumitomo Corporation has found a way to make money from fusion technology before a single power plant goes online. Here is how a 400-year-old trading house is rewriting the rules.

What Is Nuclear Fusion Energy?

Nuclear fusion works by smashing light atomic nuclei together at extreme speeds, merging them to release enormous amounts of energy, the same process that powers our Sun and every star in the universe. The fuel, hydrogen isotopes, can be extracted from ordinary seawater in virtually unlimited quantities.

Unlike traditional nuclear fission, fusion produces no high-level radioactive waste and emits zero CO₂. There's essentially no risk of a runaway meltdown. That's why fusion is often called the "ultimate clean energy." But here's the catch: achieving sustained fusion requires heating plasma to over 180 million degrees Fahrenheit (100 million degrees Celsius) and holding it stable, something no company or research institution has managed to do commercially yet.

Sumitomo's Unconventional Approach

Japanese companies have been rapidly entering the fusion space since 2023. In a major headline-making move, a consortium of 12 Japanese firms led by Mitsui & Co. and Mitsubishi Corporation invested approximately $860 million in MIT-spinoff Commonwealth Fusion Systems (CFS) in August 2025.

But Sumitomo Corporation has been playing a completely different game.

Sumitomo entered the fusion industry in June 2022 with an investment in U.S.-based TAE Technologies, making it the first Japanese company to invest in an American fusion startup. In July 2023, it signed a collaboration agreement with UK-based Tokamak Energy, and in April 2025, it formed a strategic partnership with U.S.-based SHINE Technologies.

What's striking is that each of these three companies employs a fundamentally different fusion technology. TAE uses a beam-driven field-reversed configuration (FRC), Tokamak Energy uses a spherical tokamak design, and SHINE works with deuterium-tritium reactions. By deliberately diversifying across competing approaches, Sumitomo has positioned itself to benefit no matter which technology ultimately wins.

Making Money Before the Power Flows

Yohei Nishitsuji, who leads Sumitomo's fusion-related business at the company's Energy Innovation Initiative (EII), puts it plainly: "Fusion energy is already a business."

While commercial fusion power remains years away, Sumitomo spotted a different opportunity: monetizing the derivative technologies developed along the path to fusion.

The high-temperature superconducting magnets, neutron beams, and radioisotope production systems being created for fusion reactors have immediate applications in entirely different industries.

Here's what's already happening: TAE has spun off its battery technology expertise into TAE Power Solutions, serving the electric vehicle sector. Tokamak Energy has commercialized its superconducting magnet technology through a subsidiary called TE Magnetics, targeting medical MRI systems and industrial applications. SHINE Technologies is already running a commercial business using neutron beams from fusion reactions for non-destructive testing in aerospace and defense. It's also producing medical isotopes, radioactive materials critical for cancer diagnosis and treatment that face severe global supply shortages.

Sumitomo leverages its vast global network spanning 125 offices across 64 countries to help these startups build supply chains and find customers. As Nishitsuji explains: "When you talk to people in the fusion industry, the discussion centers on energy applications. But from our perspective, fusion technologies span nearly every industry, materials, medical, inspection, and more. Startups can't do all of that alone. That's where a trading company can add real value."

Where Does Global Fusion Development Stand?

Private investment in fusion has exploded. As of November 2025, cumulative investment in fusion startups reached approximately €13 billion ($15.5 billion), jumping by over $3.7 billion in just a few months.

The United States dominates the field. CFS has raised about $3 billion total and plans to build the world's first commercial fusion reactor, called ARC, in Virginia, with operations targeted for the early 2030s. Google has already signed a power purchase agreement for 200 megawatts from ARC.

The biggest headline came in December 2025, when TAE Technologies announced a $6 billion-plus merger with Trump Media & Technology Group, creating what could be one of the world's first publicly traded fusion companies. The merged entity plans to begin construction of a 50-megawatt utility-scale fusion power plant in 2026. As an existing TAE shareholder, Sumitomo Corporation stands to benefit directly from this development.

Meanwhile, ITER, the massive international fusion research project in southern France backed by seven member entities (35 countries), has seen its timeline slip repeatedly. Start of operation is now pushed to 2034, and total project costs have ballooned to around €25 billion (roughly $27 billion). The delays have accelerated a shift from government-led megaprojects toward nimble private-sector startups.

China is also charging ahead with state-backed efforts. China Fusion Energy Co. has raised approximately €1.9 billion ($2.2 billion), and the country is developing its own prototype reactor called CFETR.

Japan's National Fusion Strategy

Japan updated its Fusion Energy Innovation Strategy in June 2025, setting a target for power generation demonstration in the 2030s. The country has deep fusion expertise, its JT-60SA facility in Ibaraki Prefecture is one of the world's largest tokamak experimental devices.

Japanese startups are gaining ground too. Kyoto Fusioneering, a Kyoto University spinoff, raised approximately $63 million in September 2025 and has become a global hub for fusion plant peripheral systems. Helical Fusion, which inherited technology from Japan's National Institute for Fusion Science, is pursuing a unique helical approach. In the laser fusion space, Nobel Prize laureate Shuji Nakamura's Blue Laser Fusion has attracted investment from ITOCHU Corporation.

What Makes Sumitomo's Position Unique

The reason Sumitomo's strategy is called "unusual" in Japan's business press is simple: while most companies take a wait-and-see approach to fusion power, Sumitomo is generating revenue from fusion-adjacent technologies today and channeling those resources back into the industry.

The SHINE partnership is particularly promising. Medical isotopes like molybdenum-99 and technetium-99m are essential for cancer diagnostics worldwide, yet face chronic supply shortages. If fusion-derived production methods prove viable, the market opportunity is enormous. Sumitomo is positioning itself as the bridge connecting SHINE's technology to pharmaceutical companies across Asia.

The company's approach reflects the Sumitomo Group's 400-year-old business philosophy of jiri-rita kōshi ichinyo, the idea that one's own interests and the interests of others and society are inseparable. This long-term thinking enables Sumitomo to invest patiently in an industry where many others demand quicker returns.

Significant technical and economic hurdles remain before commercial fusion power becomes reality. Yet Sumitomo's model demonstrates something important: you don't have to wait for the dream to come true to build a real business around it. By monetizing the journey itself, the company is helping accelerate the entire fusion ecosystem.

In Japan, the "sōgō shōsha" (general trading companies) are uniquely positioned to drive fusion industrialization, connecting cutting-edge startups with global supply chains and diverse industry applications. How is your country approaching fusion energy development? Are derivative technologies getting attention alongside the quest for power generation? We'd love to hear your perspective.

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