I posted this on here because I was interested to learn today that although battery technology (being based on chemistry) isn't improving very quickly (certainly not exponentially like electronics does), the cost _is_, and it's the same for PV. I find that result surprising.

As for the rest of the article, it's a nice breezy graphics-heavy overview of a lot of the renewables sector and I think the TL;TR from Bloomberg is that things are changing fast and there's a lot to be optimistic about.