Here’s a recent study from Cambridge that puts it at 39%. The studies I’ve seen with higher numbers always seem to be funded by firms involved in crypto trading.

https://www.jbs.cam.ac.uk/faculty-research/centres/alternati...

39% renewable, which is actually higher than I expected. I said renewable and opportunistic power capture. The latter is a large proportion of mining because it is effectively free income. There are a lot of places in the world where excess power is generated and wasted because there aren’t uses on site. Bitcoin mining is a relatively cheap way to offset cost of operations in these areas.

Where does the 80-90% number come from, though? Is that just you speculating or has someone come up with that estimate?