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Scientists in the US have finished building the National Ignition Facility - a colossal new physics experiment which aims to recreate the blistering conditions at the heart of the sun.
Dr Moses said that a single shot from the Nif's laser - the largest in the world - released a million billion neutrons and produced for a tiny fraction of a second more power than the world was consuming.
Part of the problem has been that the technical ability to reach "breakeven" - the point at which more energy is produced than is consumed - has always seemed distant. Detractors of the idea have asserted that "fusion energy is 50 years away, no matter what year you ask".