GÜNDER (International Solar Energy Society – Turkey Section) which was founded in 1991, maintains studies in development of industry, science and technology in the field of solar energy by establishing the regulatory framework and raising awareness. GÜNDER is a unique non-governmental organization of Turkey that consists of administrators and civil servants of public bodies, academic members and industry representatives of Solar Thermal and PV, is the voice of solar energy by representing the entire value chain. GÜNDER is not only Turkey Section of ISES, but also the member of DGGN (Danish Green Growth Network), SolarPower Europe (the new EPIA, European Photovoltaic Industry Association), ESTIF (European Solar Thermal Industry Federation), MESIA (Middle East Solar Industry Association), GSC (Global Solar Council), Türkiye IMSAD (Association of Turkish Construction Material Producers) and TOBB (The Union of Chambers and Commodity Exchanges of Turkey), and represents Turkish Republic in the programs of IEA SHC (International Energy Agency Solar Heating Cooling) and IEA PVPS (International Energy Agency Photovoltaic Power Systems).