Photovoltaic technology allows us to directly transform the energy that comes from solar emission into electric power. This technology uses the so called photovoltaic effect, which is based on the features of some semiconductor materials (the most used is silicon, a very common element in nature). When this semiconductor materials are properly treated they can generate electricity if hit by a luminous radiation. A photovoltaic plant is made of several solar panels, connected to a power inverter in rows and in parallel. The inverter transforms direct current that comes from cells into alternating current, ready to be used. Lastly, the system is completed by a retaining structure that serves to fix the panels to the installation surface: ground; roof; facade; etc. The structure can be fixed or movable, so it can follow the sun through its daily route all year long.