Consumer adoption is gradual (s-curve), enterprise tends to order large batches - fleets of taxis, cargo, delivery and service vehicles - so adoption in steps.

As the night falls, they all start charging at 00:00 with a huuge load spike on the grid. My bet is soon after, night time will cease to be the cheapest time to charge. And EV companies will be required to pay taxes to cover infrastructure costs , in turn hiking EV price.