This is true Eddie. For example the Chademo charging connector that Nissan use on the Leaf is a two way system, able to pass current back to the grid.The last client was apparently selling surplus supply back to the grid, but I don't know how that works, or whether it was even true.
This is very popular in Denmark where the electricity suppliers are set up for it. The benefit for car owners is that they can set their timers to charge from low cost night rate electricity, then on days when not using their car, allow the content go back to the grid for a larger rate per kW, so making a profit which is deducted from their electricity bill.
The benefit for the supplier and the country is that the current feedback in the day reduces the generation need.
It works well. Take my car battery for example, it's 40 kWh. That's sufficient to supply my all-electric flat for 5 days in Summer or 1 of the coldest days of winter when the electric heating cost makes up most of the demand. So that quantity returned to the grid from each car is a very useful contribution for daytime demands. With next year's over 60 kWh batteries it will be even more useful.
I agree with the governments who believe car owners will be a significant part of each countries future generating infrastructure, spreading the generation and demand load. After all, most of the near 30 million of our cars stand idle most of each day, so they might as well be supplying the grid and earning money for their owners.
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