
The European Union and six member states have reached a deal on the financing and timetable for an experimental nuclear fusion reactor.
An explosion in costs had cast a cloud over the International Thermonuclear Experimental Reactor (Iter).
The project, which is to be based in Cadarache in southern France, aims to harness the same physical process that fuels the Sun.
Additional construction funds will have to come from within the EU's budget.
The extra 1.4bn euros will cover a shortfall in building costs in 2012-13.