Idriss Hared. Solar energy potential atlas for planning energy system off-grid electrification in the Republic of Djibouti. Energy Conversion and Management, Elsevier, 2013, 69, pp.131-147 In order to improve geographic information and accuracy of this solar atlas, we then disaggregated irradiation maps with a 3 arc second (~ 90 meters at the equator) Digital Elevation Model (DEM), by taking into consideration terrain-related shading effects and elevation gradient. As current software solutions don't allow downscaling of preprocessed maps, we performed this work by computing our own global model, combination of horizon, elevation correction and irradiance splitting models. The horizon model we developed was assessed and compared with other existing models by using a theodolite in mountainous areas of Corsica.Finally, according to the final computed atlas, during the year 2010, mean irradiation all over the country was around 2100 kWh/m² and about 82% of the country received over 2000 kWh/m². Furthermore, the solar radiation reaching Djibouti corresponded to 20 000 times the total yearly energy consumption of the country in 2005. The retrieved irradiation maps can be used to evaluate relevance of the solar resource over rural areas of the country, and implemented within energy models in order to size stand-alone solar systems.