Compressed air storage is imho the wrong approach. Most people agree with me which is why it does not get funded, or win any of the commercial money auctions in this sector.
Does your "compressed air storage" comment apply to Highview Power's Liquid Air Energy Storage (LAES) technology?
Would be interested in understanding your thinking on this
There may be special cases, but until/unless I see someone do the sums to suggest otherwise I think that the technology pathway of lithium battery storage is the most attractive one.
An example of a special case is pump/storage hydro where a favourable location combines with both good sources and good loads. There aren't so many of those, and they tend not to be globally scaleable. Nor is the technology cost curve helping them deploy.
I've also done the sums as you know, both for how much storage is required, and when it is required. Likewise I have thoughts about where it is required in grid architecture terms. None of this suggests an urgent need to scale static storage massively for another decade. Interesting and quite sizeable experiments, yes. Massive scaling, no. *
I'm not saying that compressed air storage cannot happen, but it is for the proponents of it to do the sums in all respects, and show them openly. Not just the hand wavey stuff that we see too much of.
(there are some sums in discussion occasionally on the Tesla thread at viewtopic.php?f=76&t=5037&p=274442#p274442
, and that is about as close as you can get to an investable storage play imho. Mind you it comes with a lot of trailing wires attached. The others that I know in this space that I think are potentially viable are nowhere near pure plays, and have even more wires attached ........ ! But in any case any storage play needs to do a full & fully disclosed analysis of themselves and of lithium on a level playing field basis before they deserve attention)
* If you look at the Tesla numbers I give you can see that static storage has declined from 13% of the pack use, down to a low of about 3%, and is now at about 6%. So that gives you an insight into where Tesla are setting the prioritisation. And they are the market leaders ...... Interestingly I don't see anyone else tracking these numbers in public apart from me. Presumably Lazards etc are all doing it in private, but I am not inclined to buy their reports.