Besides manpower, fusion projects need a huge amount of materials, such as high power magnets, specific metals, capacitors and power semiconductors. Helion's Kirtley said the timeline of the company's latest prototype, Polaris, was set entirely by the availability of semiconductors.
China is making moves to corner the supply chain for many of these materials, in a similar play to how it came to dominate solar and EV batteries.
"China is investing ten times the rate that the United States is in advanced material development," Kirtley said. "That's something we have got to change."
Shanghai-based fusion company Energy Singularity told CNBC in a statement that it "undoubtedly" benefits from China's "efficient supply chain." In June, Energy Singularity said it successfully created plasma in record time, just two years after beginning the design of its tokamak.