You only scale it up to a certain point, then you replicate. Just like windmills and other kinds of things that don't scale infinitely large. Pumped storage can be scaled more easily because you only need to scale the size of the bodies of water above and below. Though "easily" is all...
Sorry, I got distracted from this discussion by some "actual work" :)
We are looking at large scale, but not utility back-up per se. Buffering of transmission, peak shaving, and buffering of intermittent renewables (wind, solar) to smooth them out. Most storage is actually used as a buffer...
It's true, there isn't a lot yet on the web site. I wasn't trying to promote it so much as to answer the thread to say, "hey, that's what we're trying to do." It's not trivial to use gravitational potential energy at a large scale, as has been pointed out. We're trying to do it, that's all :)...
All patents are specific. This one is about storing electricity per se, not the mechanics of generating electricity from mechanical force, which clearly has been done. The symmetrical in/out is what the patent covers (e.g. treating the whole thing like a black box, with plus/minus terminals on...