Firstly, when they add these types of charging stations, they will make the grid ready.

Secondly, grid has a lot of capacity. Its like motorways, most of the time its under utilised. Only during peak time that it is full capacity. Think of the grid in a similar way. Its mostly under utilised except for peak time. All we need to do is make use of it outside peak time (with batteries) and suddenly we have double or triple the capacity.