In NYC at least, electric supply charges are distinct line items from electric delivery charges. Consumers do have the option of choosing who supplies their electricity (e.g. namely if you want to buy your electricity from a green source). But the local monopoly is always entitled to charge you for the service of actually delivering said electricity to you.

Both charges fluctuate from month to month. When I still lived in Indiana, the local monopoly lumped together supply and delivery charges into a single line item which, interestingly enough, was significantly lower than what I pay for just delivery now.

The following prices are for roughly April.

NYC (ConEd) delivery charge is ~$18/month + ~$0.123/kWh. Supply is usually something like ~$0.115/kWh.

Indiana (Duke Energy) total cost (including both supply and delivery) was ~$9/month + ~$0.115/kWh.