33?, impressive. thanks.

1kg of liquid hydrogen takes up 14L of volume, plus the tank itself.

That's true for a gas turbine plant, is it true for coal fired?

I'd argue that's an invalid comparison. We don't build it up all the way, it's more like it's lowered to earth from orbit. We already lower things more than 10km into the ocean. Once the initial connection is made, it's a generation of building it up enough to support traffic. I don't think we'll ever see even the beginning of it but one day maybe. If we really expand into space it'll make economic sense.