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Discovery looks at new designs for nuclear fission reactors such as the pebble bed reactor, and asks how efficient and safe they will be.

We visit France where three quarters of its power already comes from nuclear stations and discover if this is a model for other parts of the world.

And we look at the holy grail of power production ? nuclear fusion. France is starting to build the world?s only research reactor that generates energy using the same methods as the sun. But will it ever deliver?

This is the last of a four-part Discovery series, "Fuelling the Future".

Listen here (Real)

First broadcast: Wednesday, 08 March, 2006 at 1006 GMT