This thesis examines charging of electric vehicles with charging power of 3,7 kW, in connection to an apartment building in Sweden. Also the power consumption of six electric vehicles are investigated. The charging-simulations of the electric vehicles were performed with the electric vehicle charging model (Grahn-Munkhammar) in MatLab. To simulate general energy use for a housing complex, the measured energy consumption per year for a building with 24 apartments was used. Three different systems with charging over a year were simulated. One system included six different models of electric vehicles, another system included six Tesla model S and yet another one included six Mitsubishi Outlanders. The simulations of electric vehicle charging resulted in a charging pattern with a considerable variability and an aggregation effect with a value over 20 % for all three systems. Results show that electric vehicle charging adds to the power peaks of the apartment building. However, according to the model, the aggregation effect implies that effect values of total electric vehicle charging were not harmful to an apartment building with a fuse of 63 A.