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In a lot of cases the battery lasts longer than the rest of the car, so wearing out the battery a little bit quicker might not affect the cars lifetime. People are getting 200,000 - 250,000 miles out of their batteries. Many cars wear out before that time, especially in parts of the country with winter and salt.

If there is a net benefit for both the vehicle owner and the utility, the utility should pay the owner. A school district bought battery electric school buses with a subsidy from the utility on the purchase price.

What really makes the most sense is reusing used EV batteries for household power.