U.S. to announce scientific breakthrough on fusion energy -sources

The U.S. Department of Energy will announce on Tuesday that scientists at a national lab have made a breakthrough on fusion energy, the process that powers the sun and stars that one day could provide a cheap source of electricity, two sources with knowledge of the matter said.

The scientists at Lawrence Livermore National Laboratory in California have achieved a net energy gain for the first time, in a fusion experiment using lasers, one of the people said. The FT first reported the experiment.

Fusion works when nuclei of two atoms are subjected to extreme heat of 100 million degrees Celsius or higher leading them to fuse into a new larger atom, giving off enormous amounts of energy. But the process consumes vast amounts of energy and the trick has been to get more energy out than goes in and to do so continuously instead of brief moments. If fusion is commercialized, which backers say could happen in a decade or more, it would have additional benefits including producing energy without radioactive nuclear waste that today’s fission reactors produce.