Despite ongoing political changes in the United States and Germany, the transatlantic allies continue to have deep, shared agendas. On climate change, however, Germany and the United States differ. Accepting these differences, the surprising truth is that the United States and Germany have tremendously overlapping interests in a wide variety of areas that might collectively be referred to as the clean energy economy. Both countries understand the economic opportunities and security benefits that flow from clean energy. This paper highlights nearly twenty concrete areas for transatlantic cooperation on clean energy, looking both at the domestic and international level. These policy recommendations focus primarily on the economic and security benefits of transatlantic clean energy cooperation.