Imagine if over a period of time all petrol cars owners get converted to Electric Car owners. Imagine the amount of load that would be put on the Existin Grid during charging of the electric cars. These modern cars would be charging from the old grid that existed 15 to 20 yrs ago, a grid that cannot expand anymore, one that cannot take any more load and such a grid could go offline intermittently and almost on the verge of collapsing completely.