Japanese consortium invests in US fusion startup to advance nuclear fusion power technology

Commonwealth Fusion Systems Raises $863 Million Series B2 Round

Commonwealth Fusion Systems Raises $863 Million Series B2 Round CFS Eyes Reactor In Japan General Atomics Invests $20 Million in Canadian Nuclear Fusion Venture to Advance Tritium Fuel Cycle Technologies Commonwealth Fusion Systems Raises $863 Million Series B2 Round This round of capital is the largest raised among deep tech and energy companies since CFS'…

Japanese consortium invests in US fusion startup to advance nuclear fusion power technology

A group of 12 Japanese companies, including Mitsubishi Corporation, NTT, and Kansai Electric Power, announced on September 2, 2025, an investment in Massachusetts-based nuclear fusion energy startup Commonwealth Fusion Systems (CFS), the first time Japanese firms have invested in CFS, with the intent to acquire construction and operational technologies to expedite nuclear fusion power commercialization in Japan.