It uses Nissan Leafs and a wall box called Power Loop I think  but as stated above, it’s only Chademo connector that works  CCS being developed, but a few years away.  My Honda e us V2G capable, but need to CCS protocol and compatible wall box.  and for V2G wall boxes to come down in price  - they are more than £3k currently 

https://www.ovoenergy.com/electric-cars/vehicle-to-grid-charger

I posted some time ago about that community in Utrecht that was doing just that, using their EV's as battery storage.

EV is slightly different in that this is transportation and you'll be saving on fuel. We hardly ever use our car, and even less since Covid struck, so it'll make sense to get an EV that can double up as a home battery - the economics makes a lot more sense, provided that it doesn't impact too much on the battery life.  

Is V2G available/working anywhere in the world right now?

https://insideevs.com/news/342354/charin-ccs-combo-standard-to-offer-v2g-by-2025/

Just a bit more on battery degradation, as I didn't want to seem like it doesn't happen. Like any component in a car, they are subject to wear and tear and they will slowly lose capacity as they age, but this lose has been much lower than originally expected. Plus most EV batteries are covered with long warranties.

A lot of the issues regarding battery degradation comes from peoples experience of mobile phone and laptop batteries. Lithium-ion batteries are notorious for their lack of longevity in these kinds of devices, so when people see that this is the same type of battery that is fitted to cars, then there is the worry that they behave in the same way. The lithium-ion batteries fitted in cars have a different chemistry makeup to your phone battery as the environment they work in is completely different.

If your current car usage would support a shorter range, small car, then there are now plenty of cheaper used Nissan Leaf, Renault Zoe and BMW i3 to dip your toe in the water of EV ownership, until V2G comes along.

Thanks for the rundown and explanation on battery degradation. That would be my biggest concern about EVs because replacement costs will be very high.  

I don't think a lot of the current EV's that have the CCS connectors are capable of doing V2G. As CCS is the standard for rapid charging on most new EV's, it is a technology that is still a while off.

As for the concern over battery degradation, don't worry about it. The industry was very naturally cautious when mainstream EV's were launched about 10 years ago, as the battery technology was a bit of an unknown quantity. The Nissan Leaf did suffer with some issues because it has a battery that has no active cooling/heating. In most other EV's, the battery temperatures are actively managed so it is not much of an issue.