On Tue, 01 Dec 2020 00:44:39 +0000 (GMT), Dave Plowman (News) wrote:

We already have a high amp supply to nearly every house. Largely unused
at night. Nor will the average car user need to charge the battery from
empty to full every night.

Yes but it's engineered to depend heavyly on diversity. It doesn't
take many "extra" 2 kW loads to overload the local distribution.
Mains gas doesn't fail very often but when it does and the gas board
give out loads of fan heaters it's not unknown for the local
electricty substation to catch fire or trip out a few hours later...

--
Cheers
Dave.