well,technically if you live near an ocean, and you can utilize ocean waves, some sunlight wind, you could either store energy for free
or use energy to make hydrogen for the car...
but energy can certainly be free
Because of my education in engineering economy, I have come to believe there is nothing free. That education was not free, either, although a while ago and cheaper than it would be now.
How do you extract the energy from the sources you mention? Tyrbines for wind are not cheap, and my company does marine construction. We don't install wave generation plants for nothing, I can promise that!