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As a couple of random comments:The issue of on-street electrical vehicle charging is becoming more prevalent as bizarre scenes continue to emerge throughout Sydney.
I don't have figures for anywhere in Australia but in the US state of Tennessee about 45% of homes park cars at a location to which power is readily available. That's from a proper survey conducted across a statistically sufficient number of properties, supported by government and the local utilities, so should be accurate. So from that it seems about half can be charged easily and about half can't (bearing in mind that the survey results included homes with no car, so 45% of homes is very close to half of the homes with a car).
How that relates to Australia I'm not sure but gut feel tells me it won't be hugely different. For reference the largest city (on a "greater metropolitan" basis) in Tennessee is Nashville with population of 2 million so directly comparable to Perth or Brisbane. Second largest is Memphis with population of 1.325 million so directly comparable to Adelaide. Total state population is 6.77 million. So it's not a high density "big city" sort of place really, there's a lot of freestanding homes much as we have in Australia it's not all high rises etc.
On the question of charging from streetlights, that one is very much an "it depends" situation.
There are certainly existing streetlights where it could be added quite easily. Plenty of capacity is available and supply is on 24 hours per day.
There are also streetlights with power not supplied, at all, when it's daylight and which have no spare electrical capacity at all when the lights are on. They have zero potential to add a charger without major works to replace cables which may itself require installing new conduit (so digging up the street).
So it's highly dependent on local circumstances. There are differences between Australian states (eg the older suburbs of Hobart, including the CBD, with it's centrally switched system and pilot lines), there are differences in terms of how much spare current carrying capacity exists and so on. Even within the same suburb it can be inconsistent. Then there's the existence of ripple control in Qld and NSW and the potential to apply that.
That said.... For overhead lines where there's a 230/400V supply available well in most situations it wouldn't be difficult to put a charger on the pole so long as it can all be externally mounted and the relevant transformer has sufficient capacity. Where it does become difficult though is that in many cases the pole isn't in a useful spot for charging vehicles, indeed in some states poles have very intentionally been placed on property boundaries etc historically wherever possible.
So it varies.