The transport transition towards e-mobility requires distribution system operators to prepare in a timely manner, just like in case of the PV development. It seems appropriate the differentiate between home charging stations (wall boxes), which will be distributed over the whole grid, and fast charging stations (DC hubs), which require large power at certain points.

A first step in this direction is to estimate the current grid connection potential, i.e. the free connection capacities. A follow-up step with regard to home charging stations is the estimation of the grid expansion requirements on the basis of different scenarios for the market penetration of e-mobility. The comparison of the scenarios with the actual development subsequently represents the input variable for investment planning and management.

The basis for estimating the potential of fast-charging locations, which were carried out together with research institutions, were among other input parameters traffic analyses. It should be noted at this point that the actual locations and the speed of expansion of both home and fast charging stations are determined by our customers.

In order to ensure that investment planning is as targeted as possible the evaluation and modification intervals of these should therefore be increased at medium and low voltage level. This requires a high degree of automation of the grid analysis, especially at the low-voltage level. This goes hand in hand with corresponding data availability. This is also necessary in order to be able to process "e-mobility requests" as quickly as possible and in the best way.

An essential factor is the estimation of the simultaneity behavior of e-mobility. This is not to be considered on its own, but in combination with the existing load behavior. The estimation is regularly evaluated with grid-related measurement data and smart meter data and adjusted if necessary.

The results as well as the results of PV development, have been the basis for the adaptation of the grid planning guidelines. For example, the standard cross-sections for medium and low voltage as well as the rated power of the transformer stations have been increased. As a simple planning principle, the target value for the "characteristic short-circuit power" (loop impedance) at the low-voltage connection points in urban areas was increased to 1 MVA.

With the increasing market penetration of e-mobility, the expectation is that the share of public charging and thus the number of "charging hubs" will increase.