China's leadership is in the middle of overseeing a green transition of the Chinese energy system that aims to replace fossil fuels with clean energy. This will help make China's air cleaner and reduce China's emissions of greenhouse gases. To move the energy transition ahead, there has been an acute need to continuously develop and adapt guiding policies and regulatory frameworks to stimulate the development of green technologies, complex reform solutions, and appropriate institutions. The responsible Chinese authorities and energy policy actors have chosen to collaborate with international partners to do this. They see Denmark as a best-practice learning case, and through a strategic government-to-government partnership, Denmark has gradually become one of China’s preferred strategic policy interlocutors on energy politics.