Originally Posted by Whatfur
Are you not kind of describing what is already being done tapping into hydro and tidal...yet they don't need the pumps?
Yeah, but this is about storage, not production; and doesn't require a river or an ocean as an energy source. And it doesn't necessarily have to be installed on an industrial scale. A single house, or a neighborhood, could use a system like this to bank whatever transient energy sources might be available to them.
Btw, I've just been moved from 95% work at home to a mostly on site presence. Feugh.