One of the most consistent trends of the 20th to 21st century is the increasing demand for energy. As time goes by, we get better and better at conserving energy, with electrical gizmos that become more and more efficient. However, there are more and more gizmos. If you take into account electric cars, and the use of electricity in manufacturing, you can see that more electricity will be required, in spite of the improved efficiencies.
It is also true that the ready supply of abundant energy is one of the drivers of improvements to everyone's life style, and a way to lift poorer peoples out of poverty.
Personally, I think the mid to late 21st century will be characterised by much more abundant energy than the present. I think we have yet barely scratched the surface in developing better energy systems.