The PEV should be considered a special case when compared with devices connected to an ESI, such as a thermostat.
1) The Electric Vehicles may only be connected to the ESI/Meter for charging. It may be away for extended periods of time or roaming. (Student at college, parked at an airport)
2) For an electric vehicle to take advantage of special utility rates or to accept an Electric Vehicle and provide a roaming capability a EUMD or sub-meter dedicated to each Electric Vehicle has to be available.