The building sector accounts for more than a third of global energy consumption, and nearly 90 percent of total energy consumption in the building lifecycle depends on its operation. In recent years, the spread of IoT technologies in buildings and the adoption of pervasive smart-metering systems have enabled the acquisition of a massive amount of high-frequency energy-related data. Leveraging this data to extract and formalize knowledge is essential to characterize the actual performance of buildings during operation and take action to reduce energy consumption, prevent energy waste, and promote a more efficient way of managing buildings. A valuable tool employed to monitor, analyze and control building energy systems by taking advantage of advanced data analysis technologies are so-called energy management and information systems (EMIS).