Care should be taken when considering the
connection of Low Carbon Technologies (LCT) such as electric vehicles (EVs), as
studies such as My Electric Avenue have shown that the use of slow chargers
(3.5 kW) can more than double the peak demand of a domestic property.
Charging events will often last for several hours
at the sustained rate of the charge point, affecting the after diversity
maximum demand (ADMD) of electric vehicle (EV) charging – as a result, the
total kW rating of the EV charging point should be added to the ADMD values for
domestic properties, unless there is more than 20 EV charging points on the
feeder in which case we apply a 0.5 diversity factor which means half the total
kW rating of the EV charging point can be used.
In summary:
- ≤ 20 EV charging points connected to a feeder,
EV demand = total kW rating of charger
- > 20 EV charging points connected to a
feeder, EV demand = 0.5 x the total kW rating of charger
Full guidance can be found in our Planning
Standards for Low Voltage Distribution Network (TG-NET-NPL-001) policy
document.
We are committed to reviewing whether these figures
should be revised in light of the latest datasets as they become available, and
will update our stakeholders if/when we do