ADEME (French Agency for Wastes, Environment and Energy Management). Public body devoted to the promotion, funding and support of RES. (French only, even if the Union Jack is there, .... linkless!)

American Solar Energy Society  The American Solar Energy Society (ASES) is a national organization dedicated to advancing the use of solar energy for the benefit of U.S. citizens and the global environment. ASES promotes the widespread near-term and long-term use of solar energy.
ASES sponsors the National Solar Energy Conference, publishes SOLAR TODAY magazine and Advances in Solar Energy, publishes white papers, sponsors issue Roundtables in Washington, DC, distributes solar publications, organizes a Solar Action Network and has regional chapters throughout the country. ASES is the United States Section of the International Solar Energy Society. 

BMBF (in German). Research Ministry

California Energy Commission Home Page  state's primary energy policy and planning agency

Department of Energy

DOE Energy Efficiency & Renewable Energy Network 

Department of Environment, Energy Efficiency Office

Department of Trade and Industry

Deutsche Gesellschaft für technische Zusammenarbeit

DGS (ISES Germany) (in German)