The grid is not more than capable now.
Your argument is conveniently oversimplified.
While peakers idle back during nights, they do not have the capacity to charge 278 million US vehicles. On a minor note, many of these are fossil fuel plants, so, so much for having a green plan for EVs
Gee, I didn't know 278 million ICE vehicle fill their tanks from empty to full every day! But for some reason you believe an EV replacement would be driven that much. At 12,000 miles per year the typical EV consuming 300 Wh/mile will use 3600 kWh. Assuming use is primarily on 200 weekdays per year that is 18 kWh per night but only on weekday nights. That will consume unused capacity which the utilities will welcome.
Besides, who cares about green? Only the EV-haters. If green matters then USA coal generated electricity is as clean as gasoline at 30 MPG. If green matters then an EV can trivially move to other sources such as nuclear, solar, hydro, whatever is available. Meanwhile "environmentalists" jump through hoops making excuses to pretend ethanol is solving any problem other than providing pork for corn growers.
You make my point with peakers. They don't run at night because they are not needed. Peakers exist only because other sources such as coal and nuclear have very slow throttle response. Can take a week to reach full output. Peakers are called peakers not "reserve power generators" because they are needed to fill instant demands for short periods of time. This is something Tesla has been working on by providing utility-grade battery storage.
Of probably 100 technical issues, heres a couple:
Forcing 278 million car owners to only charge at night. Think summer vacations, holidays where millions drive long distance and need to day charge. 2nd and 3rd shift workers.
Once again, 278 million ICE drivers do not fill empty tanks to full every day.
Summer vacations, holidays, etc are 1:100 of the vehicles on the road.
Power plants need maintenance shutdowns. Can稚 do that if there痴 a full load at night and additional load during the day. Millions of step down transformers in every neighborhood will see their efficiency drop as the load increases.
Transformer and fuse failure rates will increase with a 278 million car charge load added.
That is not what happiness when a plant shuts down for maintenance.
Crowded neighborhoods and apartments dont have the electric robustness or smart technology yet to charge such a high watt density area.
They have plenty of capacity because the grid was sized for the daytime air conditioner load which is not present at night.
Ive just scratched the surface of hurdles. Like I said the electric grid is not strong enough, and wont be in 10 short years. You cant add a huge load to an existing old system without adding to it and maintain the existing reliability. Its simple math.
It is very simple math and you are trying to make it complicated with false data and false situations.
300 Wh/mile, 12,000 annual miles, is 3600 kWh for an additional average 9.8 kWh/day. That is $1/day around here where my electric bill will fluctuate from under $100/month to over $250 depending on how much the HVAC has to run. A trivial addition.