The Danish Industry is running a web system pointing at energy solutions, companies involved, projects, including solar thermal. You can find the map at http://www.energymap.dk. You find the Marstal Central Solar Heating Plant, their contact company and other information on the direct link http://www.energymap.dk/Profiles/Ramboll/Cases/Large-Scale-solar-heating-in-Marstal.
Any Danish owner of a plant or a company is invited to contribute to the common resource. Please do so.