Risø National Laboratory for Sustainable Energy (Danish: Risø Nationallaboratoriet for Bæreygtig Energi) is a scientific research organization north of Roskilde, Denmark. It was a research institute under the Danish Ministry of Science Technology and Innovation and consists of eight research departments: Biosystems, Polymer Department, Fuel Cells and Solid State Chemistry, Materials Research, Optics and Plasma Research, Radiation Research, Systems Analysis and Wind Energy. On 1 January 2007, the Technical University of Denmark merged with the Danish Institute for Food and Veterinary Research, the Danish Institute for Fisheries Research, Danish National Space Center, the Danish Transport Research Institute and Risø National Laboratory.