The smart grid concept is the grid design philosophy that diversifies the powergrids and the electricity markets. However a deep penetration of \prosumers" and distributedgeneration in urban environments could lead to significant problems from an electromagneticcompatibility (EMC) viewpoint. Traditional classification methods, used for small isolated systems, are inadequate tools to investigate, improve and evaluate mitigation measures for largedistributed infrastructures such as a smart grid. Therefore, an alternative classification method,originally developed to investigate the vulnerability of large distributed systems from intentionalelectromagnetic interference (IEMI), is used here. The method is used to analyse the smart gridconcept to investigate if the smart grid is, from an EMC and IEMI viewpoint for a large distributed system, an improvement or deterioration compared to traditional power grids (and theaspects that is attached to them)