In urban planning and city energy management, building structure and construction years may differ, which often leads to different electricity consumption. Systematic approaches for classifying buildings according to their energy performance may help urban management make sustainable decisions. The aim of this research is to study monthly electricity consumption of different buildings located at different areas of Tunabyggen AB in Borlänge municipality and extract those buildings structures that have similar features in terms of monthly electricity. This research also studied different categories of building structures and their construction years. Monthly electricity data is collected in kWh of the year 2018 from Tunabyggen AB in Borlänge. Based on the electricity consumption patterns, dimension reduction is used for implementing clustering analysis due to the feature of the data. Buildings consuming highest and lowest electricity were extracted. Analysis is made on different categories of building structures. The results show that a multi-family house built in 1950s and 1970s are the most representative building structure that consume lowest electricity. On the other hand, apartment buildings from 1905s to 1970s are the most common buildings and could indicate high electricity consumption. However, the cluster with highest electricity consumption does not have too much observations and each individual feature needs to be examined in the future.