France expects to beat Japan to host the £6.9bn cutting edge Iter nuclear fusion centre.
The research centre is expected to create thousands of jobs and has been keenly fought over for six months. Nuclear fusion is held up as the Holy Grail for nuclear scientists, offering clean and plentiful power.
Iter is expected to start operating in 2014.
The Chernobyl nuclear disaster site is to receive a new protective shell, funded by 20 nations.
Donors were expected to pledge money to the cause at the donor conference this week in London.
The 20,000t steel shield is needed to replace the original concrete sarcophagus, hastily erected over the Ukrainian reactor in 1996. It is now dangerously degraded.
Britain's hopes to raise as much as £320M have been slowed by the UK election.