It stands out to me that pumped storage only gets a passing mention. We've had that as a proven energy storage technology for decades. People in the industry love to talk about it and file FERC applications for preliminary permits on the same sites over and over (I would know, I've had to read nearly all of them over the last year at work), but it's never deployed at the scale people expected.

It'll be interesting to see if if PSH ever really takes off, or if it really does get left in the dust by batteries and other things.