...If this works - one of the apparent benefits is scale. Water-tower, and other water-pressure based systems are hard to engineer above 1-10MW (I think).... The benefit of this system is it seems to be able to scale to 100MW+ sizes. Which is what one needs to provide effective frequency regulation, smoothing and backup to a utility-scale solar&#x2F;wind park. Of course, we don&#x27;t know what the costs are yet...