A 24-year-old nuclear-fusion record has crumbled. Scientists at the Joint European Torus (JET) near Oxford, UK, announced on 9 February that they had generated the highest-ever sustained energy from fusing together atoms, more than doubling their own record from experiments performed in 1997.

“These landmark results have taken us a huge step closer to conquering one of the biggest scientific and engineering challenges of them all,” said Ian Chapman, who leads the Culham Centre for Fusion Energy (CCFE), where JET is based, in a statement. JET is owned by the UK Atomic Energy Authority, but it’s scientific operations are run by a European collaboration called EUROfusion.

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