solar and wind aren't time-use-efficient. They produce when the sun is out or the wind goes, with no regard for when energy is needed. You have to build a LOT more than what equals average capacity for average use, and then, it still won't produce if there's 0 sun/0 wind. That makes it a very expensive investment to make while it also means it will produce unused leftover energy lots of times. Cue bitcoin mining, which can make this a way better investment it otherwise would be, and can use leftover energy that would otherwise just dissipate unused. Projects that wouldn't make sense before an attached miner now do make sense.