South Sudan is experiencing serious shortage in electricity supply with only 1% of the population having access to grid electricity. The country has plenty of renewable energy resources which can possibly be exploited to generate electricity. In spite of the abundance in resources, renewable energy resources are not popular or commonly used in South Sudan. Solar energy has shown success in the domain of electric power generation. Light from the sun, or solar radiation, is the “fuel” which powers solar energy technologies. Therefore knowing the potential of solar radiation at a location, an exercise known as solar resource assessment (SRA), is very important for the selection, design and accurate economic analysis of solar energy technologies for power generation. The research work presented in this paper aims at investigating solar energy resource potential in South Sudan, to help identify potential sites for future solar power plants. Radiation data for 20 locations, covering the period from 2005 to 2018, are requested through Copernicus Atmospheric Monitoring Service Radiation (CAMS-RAD) Service user interface. CAMS-RAD Service uses Heliosat-4 method to calculate solar energy radiation at the earth's surface from Meteosat satellite images. Output data are evaluated and analyzed and annual daily average global (G) and direct (B) solar irradiation calculated for each of the 20 locations together with long term average monthly global irradiance. Results show that 99% of locations receive annual average global irradiation above 5.0 kWh/m 2 . The solar resource in South Sudan is considered favorable for the development of photovoltaic solar power plants. However, it might not be economically viable or only marginally so for concentrated solar systems.