So to that point, I guess Bitcoin miners should be concentrated in places with an abundance of energy. And I suppose the free market forces will make sure that this happens.
Not only in
places with an abundance of energy, also at
times with an abundance of energy.
Making energy is the easy part, getting the energy to the place where it is needed at the time it is needed is what makes most alternative energy sources uncompetitive compared to oil.
The nice thing about Bitcoin is that you can take generation to where and when the energy is being made rather than the other way around. There are very few applications like that.
Therefore, market forces will ensure that Bitcoin generation makes use of energy that few other applications can use. In many cases, it will be energy that would have gone to waste anyhow, for example, surplus output from wind farms during very windy nights.