[proaralyst]

Well, the chargers won't be pulling 1MW continuously, so you can smooth this out by installing batteries with the chargers. The grid demand becomes a more constant trickle into the batteries co-located with the charger

[JumpCrisscross]

No need for batteries when supercapacitors will do.

[aitchnyu]

Which supercapacitors are sold and have car-scale energy?

[tgv]

So you might have to wait an hour for your 5 minute charging time? Doesn't sound like a killer feature.