requests for permission to photocopy portions of this material for public or commercial use shall be addressed directly to the copyrirt clearance center ccc at mfocopyrightcom or the centre francais sexploitation du droit de copie cfc contactcfcopiescom this study which examines a selection of oecd member countries validates the often intuitive assumption that as a largely domestic source of electricity with stable costs and no greenhouse gas emissions during production nuclear energy is wellplaced to make a significant positive contribution with the help of a series of transparent and policyrelevant indicators the study shows in particular that nuclear energy has indeed contributed to improving energy supply security in oecd countries in a significant manner during the past years