Wow this is some conspiracy-theories. Well theres not much energy in water, so clearly you can never make a car drive on that.
Actually solar power is pretty inefficient as it is today. In the short run i think, water wind and bio are far more viable.
We probably won't run out of energy as long as the sun exists. And even if we do, we will just experience a huge fall in the standard of living. The human race have survived without electricity for hundreds of years, and could do so again. And there will (most likely) always be wood.