Electricity that we depend on every day comes from a large variety of sources. Each energy source has its advantages and disadvantages, but will continue to advance and develop. There will likely never be one clear source of energy that will serve all our needs, but a combination of all technologies can that compensate for each other seems to be the best bet for providing our energy needs.
Energy is all around us, but the trick is harnessing it in a useful way. Energy technologies work so well, that we tend take electricity for granted when it's as easy as turning on a switch. Whatever energy sources and technologies we rely on, we can look forward to a clean, healthy and bright future.