That's an interesting question and it's also an important one because the answer will influence the future of our energy supply. There are many good comments a

That's an interesting question and it's also an important one because the answer will influence the future of our energy supply. There are many good comments already so I will share an anecdote that might give an alternative view: When I studied at the university we had a start-up come over to present their product. It was miniature fuel cells with the idea to use them to power mobile phones. It was the late nineties, mobile phones were all the rage and batteries were terribly bad. Students were pretty excited and the discussion after the presentation was a big hurray on hydrogen and fuel cells. A bright future ahead. Until our professor wryly remarked: "Yeah, hydrogen is the technology which has been on the verge of a breakthrough for 30 years." Whenever I hear about innovation in the hydrogen sector I must think of that quote, and that it's now another 30 years later, nothing has changed and we are still on verge of a breakthrough. Does it mean that breakthrough will never come? Maybe. Maybe it will come, but I wouldn't be surprised if it takes another 30 years.