There's already been a number of successful trials, so I think it's inevitable it's going to happen. To what extent remains to be seen.
There's a few hurdles. First, in most jurisdictions only utilities can sell electricity, so they're the only entity that can decide to do this and there's negative inventives to do so. Secondly, customers will have to be ok with a utility or other entity using their battery which will have some impact on its life span. It'll likely be extremely negligible, but these are a new technology for most buyers and this will be a hurdle for many. Thirdly, you need scale for it to work. It's hard for a company to sell this service to a utility if they don't have enough vehicles to provide predictable availability. That means you need to have a good number of people with the expensive electrical upgrades required to have vehicle to grid.
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