[tarjei]

AFAIK there are other makers that are also ready for this. I seem to remember that the Leaf is.

What I think will be the hard part of including cars into the grid is the warranty issues. I.e. if a battery gets so much usage from the grid that it somehow gets broken or worn out, who should take that cost/ risk?

[WorldMaker]

IIRC, it was added in one of the charging standards, I want to say it was CCS. In theory every car that supports that charging standard should be capable of it, but in practice that will likely be a different matter. As few people need it, few people are likely testing that it works.

I've heard the hard part right now is more regulatory in nature. Especially in the US where energy regulations vary not just from state to state, but also sometimes regionally within states based on power utility provider for a region.