The dataset presented in this paper constitutes one of the outcomes of RÉPENER, a research project co-funded by the Spanish National RDI plan. It contains integrated information of the Spanish territory regarding energy certification, building monitoring, and geographical data. The integration has been carried out by means of semantic technologies. The adherence to the Linked Data principles guarantees the application of standard methods of accessing data as well as the links to the existing dataset on the Web of Data. The dataset is a knowledge base for end-users. It can be useful for stakeholders involved in the improvement of energy efficiency of buildings to improve their decision-making.