Presumably the EV charger communicates usage data with the utility and they reconcile that with the main meter before sending the bill.

If it's a retrofit (ie.: the ev charger/nor the meter have the right technology and setup) EV energy pattern consumption is rather unique, and is very easy to understand consumption through energy disaggregation algorithm.

It's a technology already used at utilities companies to understand for instance if a household has electric or gas hobs.

It sounds like you just have a way of tallying up your EV charging and sending it to the utility. For awhile PG&E has had separate EV plans if you physically install a separate meter, which seems silly.

As it is, our time-of-use plans are hardly any cheaper off-peak vs on-peak. They've made my plans worse and worse over the years.