U.S. fusion startup Helion told CNBC some Chinese projects are copying its patented designs, too.
"China, specifically, we're seeing investment from the state agencies to invest in companies to then replicate U.S. companies' designs," said David Kirtley, founder and CEO of Helion.
Manpower and materials
China's rapid rollout of new fusion projects comes at a time when American efforts have largely been focused on upgrading existing machines, some of them more than 30 years old.
"Nobody wants to work on old dinosaurs, " said TAE's Binderbauer, adding that new projects attract more talent. "There's a bit of a brain drain."