charging columns

In the courtyard of the building that I’m modelling two charging columns for electric vehicles are going to be installed. Shall I consider them as process energy? The building is a school whose pupils are between 10 and 14 years old. Probably the parked vehicles will be the teachers’ cars. Moreover, there are a conference room and a gymnasium that could be used by the local population, particularly during the evening. How could I estimate the energy demand from the charging columns? I could suppose that every column charges one car a day and I could search for what the typical demand of an electric car is. Actually, in the region where the building is electric vehicles aren't widespread, but the presence of charging columns should incentive them.