The outline of the IPCC WG III’s Special Report on Renewable Energy Sources and Climate Change Mitigation (SRREN) was approved at the IPCC Plenary in Budapest in April, 2008. The final report was approved at the 11th session of the IPCC Working Group III, May 2011, in Abu Dhabi. The SRREN addresses the information needs of policy makers, private sector and civil society in a comprehensive way and will provide valuable information for further IPCC publications, including the upcoming IPCC 5th Assessment Report.