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Mitsubishi Corporation will join a third-party share allotment from Commonwealth Fusion Systems LLC (CFS). CFS is a fusion energy start-up based in Massachusetts and spun out of MIT. The investment was made in collaboration with a consortium of 12 Japanese companies. This is MC’s second big move in the fusion sector. It follows their investment in Kyoto Fusioneering Ltd. in May 2023.
Fusion energy comes from combining two light nuclei, such as deuterium and tritium, into a heavier one. This process is similar to what powers the Sun. It has great potential as a future energy source. Fuel is abundant in seawater. Power generation creates no carbon dioxide emissions. Plus, just a little fuel can produce a lot of energy. Fusion is gaining global momentum. It’s seen as a key solution for decarbonization and long-term energy security. In June 2025, Japan updated its Fusion Energy Innovation Strategy. This change aims to make Japan a global leader in fusion power generation by the 2030s.
CFS is the world’s largest private fusion company. It uses the tokamak-type magnetic confinement system to control plasma. The company will build the world’s first commercial fusion power plant, called “ARC,” in Virginia. Operations are set to start in the early 2030s. Earlier this year, CFS signed a power purchase agreement with Google. This agreement is for 200 megawatts of electricity from its first ARC facility.
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The Japanese Consortium will gain valuable technical and commercial skills from CFS’s U.S. projects. This includes insights into policy, regulation, development, construction, and operations. Consortium members will share their knowledge. This will help speed up the commercialization and rollout of fusion energy in Japan.
This collaboration supports the Japan-U.S. partnership to boost fusion energy development. It shows both countries are committed to making practical fusion power a reality soon.
MC is investing in CFS to boost its knowledge of fusion technologies. This move will help them use their networks and industrial skills to promote decarbonization. They also want to ensure a stable, long-term energy supply.
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