I suspect you're correct, that electricity doesn't carry the fuel taxes that petroleum does. Not all energy is equal in total out-of-pocket cost. I'm sure "they" will figure a way around that, however, in order to fund roads, bridges and so on.

The funding of roads and bridges probably should be spread beyond fuel taxes anyway. They are needed not only for the folks who drive, but anyone who consumes, wants fire protection, access to ambulances, places to walk and ride bikes and that sort of thing. Access to right-of-way for sewers, power and phone lines are another benefit.

There is a societal good which is greater than simply moving cars and trucks around and it's probably fair to spread the cost around.

Arf