[pydry]

For storing energy cheaply for months at a time and transporting it across large distances, yes.

Pumped storage has ~90% roundtrip efficiency, good at storing energy for days or weeks but maxes out easily. The energy density of water pushed uphill is very low.

I think we should be pushing a lot more water uphill, but I see it as an alternative to or competitor to grid-scale batteries and a complement to syngas.

Syngas production will probably be most useful if built next door to a wind or solar farm and used to siphon off energy which is currently curtailed when the grid is maxed out.

It can then be easily stored in enormous quantities and easily transported by ship to anywhere in the world that needs it.