I think this may be the case -- however regulation on power generation (such as we are seeing with increased costs for PoW miners in New York State) will help deal with this.
Humans will always use more power with their growth of technology, I dont think this is anything to be alarmed about.
Renewables mate. Human usage of power need not have a negative effect on our environment. Global Warming and human use of electricity need not be linked as directly as they are today.
Even if the energy is produced without fossil fuels, the material resources used to produce these solar panels and windmills need to come from somewhere.
Humans will always use more power with their growth of technology, I dont think this is anything to be alarmed about.