SP enthuses that the technology is "scalable" but Big Gav, the author, says "I agree that there is no detail about storage capacity". So I think SP is premature. Technology like this has been around for quite a while and has not gone anywhere. There is probably a reason.

Let's hope we can find some real, scalable solutions to the energy storage need.

What is the reason?

Yes, I am probably premature in my enthusing, and I should have used the appropriate modifier 'potentially'. But we are talking about a trial.

The argument that becuase "Technology like this has been around for quite a while and has not gone anywhere" ... can be used to dismiss anything.

Battery Technology.
Cancer research.
Fusion.