It has been rumoured that tesla model 3 in particular supports bi directional charging – we are only waiting on a software update to enable this generally.
There articles online (particularly in australia confirming this is possible with a 5kw max output which will cover most household needs. Imagine buying used model 3s at the bargain prices they are and powering your home with it. This could also mean a totalled model 3 battery could made simpler to convert to home use.
https://zecar.com/reviews/tesla-model-3-bidirectional-charging-v2h-v2g
https://insideevs.com/news/742948/tesla-model-v2l-power-adapter