For example there was project of building huge solar facility on Sahara desert, where there are no electricity highways, nor consumers around. Bitcoin mining is the easiest way to join global energy market for many underdeveloped nations.
This is a good example of using the solar energy but starting a bitcoin mining facility there, it isn't going to be ideal. There are factors that you need to consider in starting one and you have forgotten about the temperature. This is just an example though but there's also a bit of reality in it.
Another energy source could be the hydro-electric, I think somewhere in the province of China there's this one big mining facility that uses hydro-electric to sustain their mining farm.