This paper employs a geographical information system (GIS) to map solar resources on the basis of satellite data (radiation at top of the atmosphere, albedo, downward radiation at surface) and to match it with demand modelling on a habitat basis (population density, energy demand intensity). PV potential use is based on estimates of practical areas for collection use (building roof areas, suitably inclined and oriented surfaces) combined with land use data (important for central receiver fields). Local measurement data have been converted to the GIS grid employed. This is a novel approach compared to previous assessment, planning and scenario work in the photovoltaic field, which has traditionally been country based. (C) 2001 Published by Elsevier Science B.V. All rights reserved.