The water we drink, or the oxygen we breathe is far more rare than energy, and yet we pay each month for power.
Although most countries charge for power they also charge for water and can sometimes be very expensive depending on the country that you live in.
Given the ever-increasing effects of climate change, I think it's likely that access to water will be a huge issue as this century progresses. Wars might even start over it. You look at somewhere like Egypt and wonder what would happen if some of the countries upstream started using or diverting more from the Nile, particularly as they grow in population. You look at China and the effort it puts into acquiring and holding Tibet - which is the source of the biggest Chinese rivers - and you wonder what would happen if India, also growing in population, decides it needs more of that Tibetan water...
I don't think a cheap and efficient solution like nuclear fusion (in theory) will be distributed to the masses. This will probably be something which is exclusive to governments
If commercial fusion power does become possible, then maybe it will be used to resolve the issue of water shortage by providing cheap green power for water desalination plants... These plants already contribute to global warming, and likely will make the problem even worse as they expand in use due to water shortages. So with the way the world is going, if fusion does become possible, I'm not sure governments will be able to hold it back for themselves or even charge excessively for it - as energy demands and resource demands increase, providing access to fusion power may be one of the only ways to avert war.