Fujikura Joins a 12-Company Japanese Investment in Commonwealth Fusion Systems
Fujikura has taken an equity stake in Commonwealth Fusion Systems, the US company building the ARC fusion power plant, as part of a consortium of twelve Japanese firms. Fujikura already supplies the high-temperature superconductor wire used in the reactor’s magnets, so the investment deepens an existing supply relationship. Commonwealth Fusion Systems has raised about $3 billion to date.
Fujikura moved from supplier to investor
On 2 September 2025, Fujikura announced an investment in Commonwealth Fusion Systems (CFS), a fusion energy company based in the United States, made together with a consortium of twelve Japanese companies. Fujikura has supplied CFS with high-temperature superconductor wire since the company’s early days, and says it is currently investing to increase that production further.
The distinction matters. Fujikura is not a new entrant placing a speculative bet; it is a component supplier taking a stake in a customer whose success would drive years of wire orders. The material in question is the rare-earth barium copper oxide (REBCO) coated conductor described in our materials guide, wound into the high-field magnets that confine the plasma.
The consortium spans Japanese industry and finance
The twelve-member group named in the announcement includes Mitsui, Mitsubishi Corporation, the Development Bank of Japan, JERA, JGC Japan, Mitsui Fudosan, Mitsui O.S.K. Lines, NTT, Sumitomo Mitsui Banking Corporation, Sumitomo Mitsui Trust Bank, and Kansai Electric Power, alongside Fujikura. The breadth of trading houses, banks, a utility and a shipping line reflects how broadly Japanese industry is positioning around commercial fusion.
What Commonwealth Fusion Systems is building
CFS was spun out of the Massachusetts Institute of Technology in 2018, employs more than 1,000 people, and has raised approximately $3 billion. It is building a commercial fusion plant called ARC in Virginia, with the stated intent of beginning operation in the early 2030s. The company’s approach depends on HTS magnets to reach the field strengths that make a compact reactor feasible, which is the same technical shift covered in the fusion section of our applications article.