This publication summarizes the results obtained and lessons learned from national case studies carried out under a Coordinated Research Project titled “Case studies to assess and compare different sources in sustainable energy and electricity supply strategies”. It provides a comparison of the costs-benefits and environmental advantages/disadvantages of nuclear power and other electricity generation options in different countries. The report is intended primarily for managers and senior experts in government organizations, research institutes and power utilities who are involved in energy and environmental analysis, interpretation of model results and translation into decision and policy making.