hydrogen stored under pressure 184 times its original density that's a lot of energy a meeting with james ferguson a specialist in hydrogen storage the highly inflammable gases locked away incompetence on the key site. oh well. so one of the big advantages of hydrogen is that it's a kind of option for seasonal energy storage and that's when we want to store a lot of energy over months so we know that in the u.k. during the winter is very low it's very windy if we go to a wind turbine based energy system we're going to have a lot more generated in the winter than we need and so we can capture that and store it in the form of hydrogen and then keep it until the summer when we don't have any wind blowing and but we're still using energy. so how is hydrogen used as a fuel. well james has a rather knotty way of demonstrating with a toy car that looks about what it said that's about 20000000. issues we have to produce hydrogen with many electrolytes so we just wait a moment we're going to generate some hydrogen we're going to build up an electric current passing through the water forms hydrogen bubble s