The World Bank’s Global Electrification Database compiles nationally representative household survey data (e.g. LSMS, MTF, DHS) as well as census data. It also incorporates data from the Socio-Economic Database for Latin America and the Caribbean, the Middle East and North Africa Poverty Database, and the Europe and Central Asia Poverty Database, all of which are based on similar surveys. In general, countries publish or update their electricity data at an interval of two to three years in time for global data collection.