If it made financial sense to purchase a bunch of micro storage to reduce the need for peaker plant production, then it would make even more sense to do so on a macro level. There is no price advantage having the storage be distributed. That is to say, there's no point in fixed micro storage for a typical homeowner.
The battery in an EV is a sunk cost, so if it can be utilized more often, for instance any time it's plugged in and there's high grid demand for electricity, it improves the return on that investment.
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