Fusion, which aims to harness the power of the Sun here on Earth, has long been tipped as the Holy Grail of renewable energy sources as well.
It promises a near-limitless low carbon energy source for the long term.
Scientists say it has the capability of meeting the global surge in electricity demand expected in the coming decades.
Professor Ian Chapman, UK Atomic Energy Authority CEO, said: “Fusion energy is low carbon, safe, efficient, and the fuels exist in abundance. It’s a gamechanger for our global energy future.
“I’m in no doubt that fusion will be a complementary part of the energy mix for generations to come.
“It’s one of the biggest scientific and engineering quests in history, up there with the Apollo programme, and the rewards for success will be huge for our planet.”