The Building of the Ente Regional de la Energía – Energy Regional Entity – embodies energy saving and the use of the renewable energy available in the area, as it is a bioclimatic building. Its design is an answer to the need for energetic efficiency: in winter it uses solar radiation, and minimizes the external loss of heat, and during the summer it protects itself from solar radiation during the day and releases the heat during the night, which reduces by 40% the energy loss in comparison with a building of similar architecture.