The aim of this document is to draft a strategic, but nevertheless technically oriented, reference book which represents the standardization requirements for the IEC Smart Grid Roadmap based on the recent work of IEC SG3. As a living document, this roadmap will be subject to future changes, modifications and additions, (i.e. completion of the mapping of a Generic Reference Architecture for Smart Grid) and will be incorporated into future editions. This roadmap presents an inventory of existing (mostly IEC) standards, and puts them into perspective regarding the different Smart Grid applications. Gaps between actual standards and future requirements are analyzed and recommendations for evolution are presented.