The Natural Philosopher gurgled happily, sounding much like they
were saying:

No worse than a medium factory.

I'm surprised a medium factory would take that much power, but the
most difficult part inside the car park is wiring up every bay to the
feed.

...not to mention what happens when some numpty cocks up parking and
takes the pole out of the ground.

Then, of course, there's the scrote factor - how many of these street
poles will be being tapped for domestic electrickery?

Well if the only work when you stick a credit card in them, not many.

The socket out will only work with a card. But the power going in to the
pole is almost certainly going to be accessible through a nice little
access hatch or similar.

OK, so the next problem is somebody unplugging your car and plugging
theirs in to your pole.

440 AC technology is mainstream in industrial places. I am not syaing
that upgrading stuff wouldn't in time be necessary, but power at the
sort of 50KW level, able to mostly recharge a small car in an hour, is
not a big problem.

Fine. Looking out the office window, I can see about twenty cars parked
either on the road in front of this building, plus the apron of the
building opposite. There's a two-level car park at the back of this
building which has probably another thirty cars in it.

That's 50x50kW = 2.5MW. On top, of course, of the current electricity
usage for the office and light-industrial buildings.

Then, of course, there's all the other buildings up and down the road.

And as far as MOST charging goes, MOST of the time people will NOT be
drawing full current. The chargers will, once the battery is full, cut
off.

So those fifty cars are only pulling full charge from 9am to mid-
afternoon...