Interesting...there are a number of large-scale projects underway to develop this energy storage technology. It's already been demonstrated on a smaller scale with sun-to-hydrogen and wind-to-hydrogen pilot projects even here in the US.
https://www.offshorewind.biz/2020/0...dium=email&utm_campaign=newsletter_2020-02-28
https://www.offshorewind.biz/2020/0...dium=email&utm_campaign=newsletter_2020-02-28