This study isn't making any sense to me. Car charging at night makes use of grid capacity when almost all other users of electricity are at a minimum.
They are saying that daytime charging at work would be better. Which is when peak demands occur because industry uses and air conditioning demands are highest.
California has a unique demand profile, I assume because of nighttime air conditioning, or maybe all the electric cars, with lowest usage during mid-day. Maybe that's why this California-based study has these findings. Or maybe because there's so much solar electric generation in California that their excess capacity is in the daytime.
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