What if cars going up a hill could be powered (Partially anyway) by the cars that are going down the same hill. I have envisioned for a long time, a powered roadway (like a slot car track) where vehicles would take their power from the road rather than having to store and carry it around. The power then could be generated in a more efficient manor. This would also create a grid where all of the vehicles could be talking to each other. At any given time vehicles would be climbing a hill taking power from the grid and some would be descending the same hill putting power into the grid. It would take enormous investment but so would millions of batteries right?
It seems to me that capacitor storage if perfected would be ideal because they would not wear out. There are no moving parts or transfer of materials in a capacitor. Wouldn't they theoretically last forever if not overheated?