This is the third evaluation of the UNEP Riso Centre on Energy, Climate and Sustainable Development (URC) since the Centre's inception in 1990. It covers URC's work programme and institutional arrangements for Phases V (2000-200 1) and VI (2002-2005), the latter up till October 2004. The purpose of the evaluation is to determine the relevance, efficiency, effectiveness and impact of the Centre. The evaluation was carried out from 21 October to 15 December 2004. The report follows the structure given in the Terms of Reference (ToR)'. Background information on the Centre (Section 1.2) is based on the ToR and documents/descriptions provided by the Centre. The scope, objective and methodology of the evaluation exercise (Section II) are derived from the ToR. The findings and conclusions of the evaluation are contained in Section III, followed by problems/difficulties identified, recommendations and lessons learned in Section IV.