What is the fine-grained topic of the following text: Following the studies commissioned by the city, two licenses to explore Strasbourg’s subsoil were given the companies Électricité de Strasbourg, for a project in Illkirch-Graffenstaden and Fonroche, for projects in Eckbolsheim and Vendenheim. Only return the topic.
Exploration licenses for Strasbourg's subsoil granted to Électricité de Strasbourg and Fonroche companies