If a generator is turning, something is turning it. THAT is the source energy. All the generator does is take that kinetic energy and turn it into electrical energy. BUT it is at a loss. So it can never get back the energy that it took to turn the generator in the first place. And that process also has energy losses, so there are two points of loss, with nothing to replace those losses except the primary energy source.
In today's cars, it is gasoline or diesel that runs the alternator/generator. SOMETHING will have to replace the gasoline. That SOMETHING is what we have not yet heard. But there HAS to be SOMETHING.
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