I think that more than half of the mining farm facilities, the huge ones are using renewable energy because of how expensive it is to operate one. It is a never ending debate about the energy that's being used to mine Bitcoin. Whoever starts this context will always get to the point to make people convince that mining Bitcoin is using unclean energy instead of clean, renewable and environment friendly energy. I have watched footages of these big mining operations that uses, hydroenergy, solar energy and wind energy. So, I don't understand why this is always being brought up without doing some research.