Wind energy technologies in the UK have the highest installed capacity and also generates the most GWh out of any of the renewable sources and it continues to be an industry on the rise. This paper presents a method of site selection for wind turbines in Cornwall (UK), based on a spatial multi criteria analysis. The method used for this is built in ESRI ArcGIS Desktop 9.3.1 software and is split into four stages. The first, a land exclusion exercise, to redact unsuitable land from contention. The second, a resource and cost analysis. The third, is a site selection and visibility analysis and the last stage is the development of a web application designed to give access to the results of the assessment over the web. The assessment acts as preliminary tool in site selection and aims to assist with the planning of wind developers or other interested parties.