So hydrogen works greatAramco just released a report on their hydrogen venture, it costs over $ 250 US per barrel equivalent.
So it will only be implemented by government doctrine. It's possible Aramco released this report to promote their main business, which is of course oil. Unless there is someplace in the world where electricity is almost free H2 is just not viable.
https://www.investorvillage.com/groups.asp?mb=19168&mn=459814&pt=msg&mid=23670621