I would say that going 100 percent solar and renewable energy is the best.  Compare to before, mining is not  like the way it was before. To some people; it is fading away and not quite profitable as it was before whereas to some it is still profitable and this could be because they are probably mining in an environment where electricity cost is low or using the solar as source of energy. 
If I where to chose, I personally  prefer solar then the usual electricity energy. it's just all about staying on a safer side.