Wind is a promising sustainable energy resource that can help in reducing the dependence on fossil fuels. Models and tools can be effectively used to assess the resource availability, the possible exploitation, and the environmental impact. The aim of this work is to propose an Environmental Decision Support System (EDSS) for the sustainable design of wind power plants both in terms of the site selection over a regional territory and of the optimal technology to be installed. Specifically, the proposed EDSS is suited to territories with a complex orography (such as several regions of the Mediterranean coasts), and for the installation of plants in the class of power between 500 kW and 1000 kW. The different EDSS modules are applied to a specific case study, supporting the decision maker on the exploitation of wind power plants in the Savona District, Liguria Region, Italy. (C) 2011 Elsevier Ltd. All rights reserved.