Touristic sector is a most sensitive one in Mediterranean countries like Greece or Spain. Buildings with traditional architecture in touristic places represent an attraction for tourists but to these buildings the integration of renewable energy sources is a difficult aspect. Energy saving in buildings is significant for the energy targets of EC for 2020 and the implementation of Renewable Energy Sources (R.E.S.) in traditional buildings always poses new challenges for designers. In this paper we include analysis for the implementation of R.E.S. respecting traditional building design and atmosphere, which signifies a new constriction, by also an opportunity, seeing the sustainability paradigm in a more general way. Solar thermal collectors, photovoltaic and wind turbines, are visible and need a special care to be also adapted with the architecture of the touristic sites. Currently developed innovative solar energy systems and integration aspects are presented and strategies for a further expansion are discussed.