Announcement of 'major' breakthrough in nuclear fusion expected on Tuesday

Scientists in the US achieved a net energy gain through a fusion reactor for the first time ever, a potential breakthrough in attempts to harness the limitless source of clean energy.

Over the preceding two weeks, scientists at the Lawrence Livermore National Laboratory reached that milestone by bombarding a pellet of hydrogen plasma with the largest laser in the world, people said according to the Financial Times.

Data from the experiment was still being analysed to certify the achievement before it could be announced, an event that was now expected on Tuesday.

The better than hoped for result however resulted in damage to some of the diagnostic equipment, making that determination more difficult, the people added.

In the 12 months to June, companies focused on nuclear fusion research attracted $2.83bn of funding, the FT reported.