The new world record has been set at the UK-based JET laboratory.
The result came from the lab’s final experiment after more than 40 years of fusion research.
The experiments produced 69 megajoules of energy over five seconds. That is only enough energy for four to five hot baths - so not a lot.
It is clear we are still a long way off from nuclear fusion power plants, but with every experiment it is bringing us one step closer.
All told maybe a few hundred kilograms of waste every decade. A small price to pay, and certainly orders of magnitude less waste than currently used fossil and renewable electricity generation technology.