Enthusiasm for hydrogen has surged in recent years. The most abundant element in the universe, it offers a wide range of potential energy applications, and many governments now see it as an important part of the solution to their energy challenges.Much of the focus has been on low‑emissions hydrogen. But building markets around a still‑emerging technology is far from straightforward. In this episode, IEA Energy Technology Analyst José Bermudez explores the obstacles that have slowed progress – and discusses why production could still grow strongly between now and 2030.