Proxima Fusion bets €140M on a critical fusion ingredient dominated by Asian suppliers

The cost of HTS tape for fusion reactors will change, as Proxima Fusion builds its own supply.

German fusion startup Proxima Fusion announced plans to construct a €140 million ($162.6 million) factory to produce high-temperature superconducting (HTS) tape. This material is crucial for generating the powerful magnetic fields needed to contain plasma for fusion reactions. The factory will be funded through a combination of private investment and public funds, with the state of Lower Saxony contributing €21 million. Proxima Fusion recently raised €411 million in a significant funding round. The HTS tape is a key component in Proxima's reactor design, with its demonstration plant requiring 20,000 kilometers and a commercial plant needing twice that amount. Currently, the global supply of HTS tape is largely dominated by manufacturers in China and Japan. The development of HTS tape over the past decade has been a critical enabler for modern fusion power startups, allowing for smaller, more efficient reactor designs.

Proxima Fusion's decision to build its own HTS tape factory signifies a strategic move to secure a critical supply chain component that is currently dominated by Asian suppliers. This vertical integration aims to de-risk its reactor development and potentially reduce costs associated with the specialized tape. The venture highlights the increasing maturity of the fusion industry, where startups are moving beyond conceptualization to address fundamental material and manufacturing challenges.

This investment could signal a broader trend of fusion companies seeking greater control over their supply chains, especially for novel materials like HTS tape. As demand for HTS tape grows from both fusion power and other advanced applications like data centers, Proxima's move may spur further competition or localized production efforts. The reliance on a limited number of suppliers has been a persistent vulnerability, and Proxima's initiative could pave the way for more resilient global production.