It makes sense to be able to manage the grid, does it not? If everyone charges at the same time there could be problems, not now but in the future when ev numbers really rise, so taking steps to avoid this makes absolute sense. With regard to allowing electricity to be taken from your EV you will be paid for this ,£200-300 per year and it won’t be done unless you sign up for it and just to put minds at ease we are talking about a small amount of electricity being taken, maybe 3 or 4 kWh. Remember 3 kWh from a million EVs is a lot of energy provision to the grid and will save billions£ each year. So don’t worry this is a good thing, unless you believe that the world is against you and everything is an attack on your liberty in that case get your tin hat on as “we’re doomed”.
To draw energy from your EV battery would require a bi-directional EV charger, Octopus and a few other energy provider have been carrying out trial for past 18 months or so, those who have been on the trials are reporting big energy cost savings.
To be honest I am looking forward to the introduction of bi-directional chargers, why spend thousands on a PV battery bank when you can use your EV battery.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.