EKOBuild’s conception is based on increasing the energy performance of building facilities, by developing and installing large scale Organic & Printed Photovoltaics (OPVs), characterized by transparency in the visible spectrum of more than >35%. The project aims to optimize large-scale Semi-Transparent OPVs, utilizing Rollto-Roll (R2R) printing techniques on plastic substrates, with transparent electrodes employing in-line laser patterning techniques and optical metrology tools in order to control the thickness and optical properties of printed nano-layers.