If every passenger vehicle were a ford lightning and every truck or commercial van were a class 8 electric semi the average charging load would be under 200GW.

If every passenger vehicle were a ford lightning and every truck or commercial van were a class 8 electric semi the average charging load would be under 200GW. Fuel demand doesn't vary much by week or by month, so only diurnal storage is needed. Just plug most of the vehicles in when parked, and then duplicate or separate 1 day worth of battery (5-20% extra) and put it at the charger or generator for the rest. Suddenly your 1200GW 'requirement' shrinks by 90%.