This research was motivated by the cooperation between Germany and ASEAN in the development of renewable energy. Germany is a pioneer country in renewable energy policy. In this regard, Germany strongly supports efforts and commitments to transition energy from fossil to renewable materials carried out by developing countries. This commitment is based on the implementation of the Paris Agreement and EU policy. The development of German renewable energy has been carried out since 1990 in their national renewable energy legislation. The development of German renewable energy has also been included in the outlook for SDG number 7. In this regard, Germany is committed to providing assistance and cooperation in energy development in developing countries, including ASEAN member states. ASEAN was chosen as a cooperation partner because member countries are still in the use of fossil energy and are in the stage of energy transition period. ASEAN member countries that are experiencing an increase in population and economy cause large energy needs so that the need for fossil energy is still fairly high. Therefore, the selection of ASEAN as a partner of German cooperation is an advantage for Germany in influencing Germany's position as a pioneer in the development of renewable energy in ASEAN. This research uses an explanatory method with data collection in the form of literature studies. The Rational Actor Model as a theoretical basis to explain Germany's rationality in cooperation with ASEAN
