The energy consumption and efficiency of buildings is determined by a multitude of factors. The aim of the IDEE project is to develop a technological infrastructure based on semantic technologies for the integration of data concerning buildings, with an emphasis on the energy-related data, and to provide techniques and tools for the visualization and analysis of such data. For the integrated access to the data, IDEE will rely on the open-source system Ontop. The project will develop a case study based on the municipality of Merano. Unibz collaborates in IDEE with R3GIS and Alperia.