[ranit8]

> 1/2 MW charging cables

Cables are rated by the current they support, not by the power of the devices connected to it. A cable up to 10 Ampères supports 1100 watts on a 110V mains, or 2200W on a 220V mains. Quick charging on electric vehicles probably is done at high voltages.

http://en.wikipedia.org/wiki/Ampacity

EDIT: you are right about home charging not possible. And to the sibling, the best storage systems for fast charging are http://en.wikipedia.org/w/Supercapacitor and http://en.wikipedia.org/wiki/Flywheel_energy_storage