When it comes to transportation, the longer the trip, the more that the cost of transporting the energy along with the vehicle becomes a factor. electric batteries are really, really heavy. And, the amount of time that it takes to recharge an electric battery becomes a source of aggravation.  One of the newer branches of research is a hybrid technology — not the kind of hybrid that sometimes uses gasoline, sometimes use electricity to power a car. Rather, this hybrid uses renewable electricity to generate a stable fuel that can be stored more efficiently, or use dense organic material to generate renewable electricity to power an electric motor.