The @IEA Net Zero Roadmap released last week foresees an important role for hydrogen, in shipping, aviation, the power sector, road transport, and heavy industry. 
Roughly 400 Mt/year = 13,000 TWh (LHV).

If that should all be green hydrogen, it would take 20,000 TWh of renewable electricity by 2050. That's around 2/3 of current global electricity production next to an increased direct electricity demand!

https://sfo3.digitaloceanspaces.com/cdn.mastodon.energy/media_attachments/files/111/186/385/201/086/849/original/f52f15a426de7a4c.jpg