This report provides a background on the methodology and results of the assessment of the long term (2050) global and regional technical potential of renewable energy sources. For renewable power also the cost distribution is assessed. The approach is based on a review of existing studies in combination with expert judgements. This analysis is done as part of the report Opportunities for the rapid deployment of renewable energy in large energy economies published by REN21. The report is prepared for the third Ministers Meeting in the Gleneagles Dialogue on Climate Change, in order to provide Ministers of participating countries an overview of opportunities to rapid deployment of Renewable Energy Sources (RES).