The projections about the global population show that the exponential growth will continue for at least another decade. With a constant increase in population, the demand for pretty much everything will constantly grow, and the biggest grow in demand will be for energy.
The more people there are, the more energy is needed and used, it's as simple as that. Also, apart from the increase in population and that being a big reason for the increase in demand for energy, the countries are also constantly developing, and for every new advancement made more and more energy is needed. Those people will also probably work, and for most work places the energy use is the basics for the functioning.