The dream of fusion energy hit a roadblock on Monday after it was revealed that it would take at least another decade and 4 billion euros for an international coalition to get its experimental reactor working.

That means the International Thermonuclear Experimental Reactor (ITER) in France won’t see its first test until 2025 and full fusion reactions until at least 2035, according to documents leaked to French Newspaper Les Echos.
ITER, a joint project between Europe, China, South Korea, India, Japan, Russia, and the United States, confirmed to Motherboard that 2025 and 2035 “are the most likely dates based on current discussion,” although neither has been officially declared. An ITER spokesperson said an official announcement concerning the project schedule will be made in June.

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