The U.S. Department of Energy’s Energy Efficiency and Renewable Energy portal contains an abundance of tools, information and background for investors in renewable energy. Whether your interest is solar, wind, green buildings, or some related topic, you may find it a valuable starting point. For entrepreneurs in particular, there are a number of programs funded by government research that the DOE is eager to commercialize somehow. U.S. government-funded research, often of extremely high quality, is available for the right company.
Department of Energy — a neglected source of information