The Thuringian Renewable Energy Network (ThEEN) e.V. is the competence network for renewable energies, energy storage, energy efficiency and sector coupling based in Erfurt. The network has over 70 members from business, science and public institutions and represents more than 300 companies through its member associations Arbeitsgemeinschaft Thüringer Wasserkraftwerke e.V., Bundesverband WindEnergie e.V. – Landesverband Thüringen, Fachverband Biogas – Regionalbüro Ost and SolarInput e.V.