Our basic knowledge of the geothermal potential in Belgium derives from existing geological reconnaissance surveys. As a result of the energy crises in the 1970s and early 1980s, efforts were made by public organisations such as the Belgian National Geological Survey and the Directorate-General for Science, Research and Development of the European Community to acquire further fundamental knowledge in the geological and technological fields related to the implementation of low-enthalpy geothermal projects. This led to the development of a low-enthalpy geothermal plant close to Mons in the south, and to a demonstration project for a doublet system in north Belgium. Following the drop in oil prices in the mid-eighties, there was a corresponding decrease in the efforts to develop geothermal installations. The resources of the potential areas identified in a previous work were assessed. This paper updates the resource assessment to the end of 1994 and describes the current, albeit limited, use of geothermal energy in Belgium. (C) 1998 CNR. Published by Elsevier Science Ltd.