The following document is a viability study of a project with different proposed solutions that have the same objective: the reduction of the energy consumption of the illumination system of the TR2 building of the UPC. The main reason is that UPC is following the general goal 2020 that is called Energy 2020, which strives to lower energy consumption intensity and carbon emissions. The illumination system of a building consumes a high quantity of energy of the building. Firstly, to know how it works the current illumination system and how much cost the maintenance per year to the UPC. Then, propose three different alternatives to reduce the energy consumption of the TR2 building. Moreover, each of these projects is financially evaluated to ensure the return of the investment for the UPC