Physics World has recently turned 30 and we are celebrating with a 5-part series podcast series exploring key areas of physics. This third episode in the series explores the prospects for fusion energy ­­– a carbon-free form of energy generation that may finally be on the cusp of becoming practical.

For the past few decades, the running joke has been that despite the excitement, fusion energy is “always 30 years away.” In the January episode of Physics World Stories, Andrew Glester meets fusion researchers at the UK company Tokamak Energy to learn about the practical challenges and the technology that could make fusion a reality within the next 15 years.

Melanie Windridge, a communication consultant (and adventurer), explains the science behind the two main approaches to achieving fusion. The first is known as inertial confinement fusion and its feasibility is being investigated at the National Ignition Facility (NIF) in the US. The alternative involves using intense magnetic fields to confine hot plasma inside a device known as a tokamak. This is the approach taken at the International Thermonuclear Experimental Reactor (ITER), an international collaboration based in southern France.

In contrast to the much larger tokamak ITER tokamak, the technology being developed by Tokamak Energy could lead to a compact tokamak that can run at much higher plasma pressure. Glester visits the company in Oxfordshire to meet the company’s chief executive David Kingham, who believes this smaller-scale approach could make fusion energy more economically viable. Both Kingham and Windridge believe that practical fusion energy has become more realistic due to two key factors – the growing global consensus that we need to act on climate change coupled with the arrival of private enterprise in this space.

If you enjoy the podcast, then take a listen to the first two podcasts in the 30^th anniversary series. Glester began in October by looking at the past and future of particle physics. Then in November he explored gravitational waves by looking at the exciting future for multimessenger astronomy. Don’t forget you can also subscribe to Physics World Stories via the Apple podcast app or your chosen podcast host.