The Energy Sector Management Assistance Program (ESMAP) is an energy assistance program administered by the World Bank. The program aims to support low- and middle-income countries to achieve environmentally sustainable energy solutions. This is achieved through numerous initiatives, which include renewable energy resource mapping.

Outcomes of the program include the Global Solar Atlas, a series of maps of annual irradiance covering the entire world.

Additionally, ESMAP has also commissioned several short-term in-situ measurement campaigns of irradiance in Africa and Asia. These campaigns include both Tier 1 and 2 stations and typically have a duration of 1-2 years. The data from these campaigns are freely available at

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