An electric car in the Netherlands uses around 300 Watt on average over a year. That's not a lot. The grid challenges arise because people like to charge them fast. 11 kW in a residential street is a lot. And so is 150-400 kW at a fast charging station.
@Sustainable2050 We need to charge the car in the daytime in the suburbs to pull the grid voltages down. Frequently seeing 250+ in my cul-de-sac.