I see both ways, BYD and GWM afaik (
@unk45 correct me please) aren't doing anything infrastructure wide directly, and also I would say there is way too much market for them to saturate
I think the real reason Tesla isn't here yet is that it isn't worth for them, even the cheapest Model 3 is expensive, and the volume would be huge market wise but not huge Tesla wise
In terms of Supercharger Network, with a quick look on the map, I would say Tesla needs maybe 20~30 sites to cover a huge portion of potential owners and with as low as 10 to cover a significant portion, this is ignoring inner city ones, and focusing just on highways
We have this huge rest stop network called Graal with 30 something locations, a Tesla partnership with them would be a really good starting point, safe, open 24/7, with amenities of all kinds, fast food, restaurants, shops, etc
Couldn't find a map for their units in all states, but this is for the state of São Paulo where most of the locations are anyway
Size would depend if it's open for all or just for Teslas, even a 6 stall Supercharger would be enough in most locations, with bigger ones in main corridors
Oh, and lots of them already have EV chargers up to 150 kW but usually one or two plugs only
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