I was reading this article on EV-charger pricing schemes. There are some vague references to states requiring per-minute pricing, but 0 explanations of that thing. A little research has suggested that it is not the case that states require per-minute pricing on EV chargers, but that they only allow per-kWh pricing by regulated utilities.
What is the reasoning behind these laws? I get that the sale of electricity by the big players is regulated because sanctioned monopoly stuff. Is this restriction on others just part of the monopoly grant? What's the deal here?