I intentionally dismissed them because renewable energy is still a minor percentage of the total power produced in the world. Not counting biomass it is 6% according to http://en.wikipedia.org/wiki/Renewable_energy
Don't forget the "growing rapidly" part. Sure, if we decide not to use renewables, we won't use renewables. But if we do, we will. We're talking about future plans here (in your words, what will power cars in 10 years).