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"the electricity delivered during off-peak periods comes from dirty coal-fired power stations--rather negating the point of having a zero-emission vehicle in the first place."

Except these so-called dirty coal plants are still far cleaner than car exhausts, and more efficient especially if you consider the extraction and refinement processes required for gasoline. Finally, it's much easier to upgrade or replace a power plant on the grid to make it cleaner in the future than it is to get thousands of people to replace their vehicles with ones that are more efficient, cleaner, etc. Nevermind the logistics involved if we wanted to do carbon sequestration.

Off-peak power production depends on where you live. In my region we only have hydro and nuclear, my energy is (relatively) clean 24/7.

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