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That seems pretty alarmist.

This system hasn't been implemented yet, but when it is, I'm sure electric vehicle owners will be able to set the conditions at which they push energy onto the grid: electric price > $X, only drain battery to Y%, etc.

If you gave me $3 for the gallon of gas I bought yesterday for $2, I would sell it if I had 10 gallons in my tank

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Even better, a very similar system is currently being implemented by Tesla (under the name Tesla Virtual Power Plant). It's for their Powerwall product rather than the cars, but I think it's safe to assume they'd design a similar system for their cars.

It looks like the Virtual Power Plant program lets you configure a backup reserve, so you can choose how much of the capacity you keep for yourself and only push a small portion of the battery's capacity to the grid.

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