Hans-Josef Fell was a member of the German Parliamentary Group Alliance 90/ the Greens from 1998 to 2013. He served as spokesman on energy for the Alliance 90/The Greens parliamentary group, a member of the Environmental Protection Committee, substitute member of the Committee on Economics and Technology and substitute member of the Defence Committee. Together with Hermann Scheer, he authored the 2000 draft of the Renewable Energy Sources Act, establishing the foundation for the technology developments in photovoltaic, biogas, wind power and geothermal energy in Germany. Fell is founder and president of the Energy Watch Group and an internationally renowned energy and climate change advisor, author and speaker.

Hermann Scheer was a Social Democrat member of the German Bundestag (parliament), President of Eurosolar and General Chairman of the World Council for Renewable Energy. In 1999, Scheer was awarded the Right Livelihood Award for his "indefatigable work for the promotion of solar energy worldwide".