Only for spain. DIAFEM is an online free application for designers, installers and anybody interested in renewable energy, for the design and calculation of electrification facilities no connected to the grid. Allows small wind turbines design facilities, photovoltaic and mixed to meet the energy needs of a demand. The tool asks, a number of technical data, to identify the project and a specific energy demand, in order to perform the calculation and design of the facility. Results are displayed in a technical report.