This again isn't compelling: it's not clear how the solution to "wasted" (read: lost opportunity) renewables is to actually waste them by cracking hashes.

(It also undermines the original point of the article: what incentive do bitcoin miners have to make renewables more available, if they can just pack up their rigs and move to wherever energy is cheapest? Mining incentivizes short-span access, not the kind of massive distribution grids that we actually need to make renewable energy sustainable and reliable.)