I wrote up a little survey[1] of the on-the-ground installed energy storage landscape nearly 2.5 years ago now (when I was first learning how to make graphs outside of excel), and really not a whole lot has changed since then in terms of trends. Pumped storage remains the vast bulk of grid-level storage, and while we&#x27;re still not building any new projects, there has been a fair amount of movement on the permitting front[2] this decade following the relative drought of the 90s and early 2000s. A few new battery projects have come online as well.<p>I feel like I&#x27;ve been reading about LightSail since I wrote that post (which feels like a lifetime ago, particularly looking at charts made in matlab, which I probably haven&#x27;t touched in 2 years), and I hope it really does start showing up soon at small commercial sites and eventually with grid-level deployment, deployment of new electrical infrastructure tech is exciting!<p>[1] <a href="http:&#x2F;&#x2F;btus.us&#x2F;the-state-of-our-energy-storage&#x2F;" rel="nofollow">http:&#x2F;&#x2F;btus.us&#x2F;the-state-of-our-energy-storage&#x2F;</a><p>[2] <a href="http:&#x2F;&#x2F;www.ferc.gov&#x2F;industries&#x2F;hydropower&#x2F;gen-info&#x2F;licensing&#x2F;pump-storage.asp" rel="nofollow">http:&#x2F;&#x2F;www.ferc.gov&#x2F;industries&#x2F;hydropower&#x2F;gen-info&#x2F;licensing...</a>