Of course we have wind, wave and solar as energy. But these sources of power will never be enough to provide for this world's growing demands. At this point we don't know how to find cost efficient sustainable energy for the country or world. And if we do, it is going to be EXPENSIVE!
Think about the cost of renewable energy. Solar power, hydroelectric power, wind power are all very expensive. To compare the price on a yearly note, I would rather just make Atomic bombs.
You can substitute energy source to coal, oil and natural gas - but these are highly polluting and also very expensive energy source that does no good to this world.