2 links below. I like the first once best because it has a cool list of folks:
International Association for Energy Economics
Journal and newsletter devoted to economic issues of energy supply and demand; organization seeks to gather both professionals and those interested in these issues form an economic standpoint
Collection of studies and reports from Doug Koplow, on energy subsidies and ongoing legislation: good analysis of the recent energy bill.
Energy Future Coalition
Nonpartisan alliance that seeks to identify energy policy options with broad political support.
Union of Concerned Scientists – Energy
We have much in common – among the five steps to take on global warming, UCS states “Yet, we invest far more in subsidies for the fossil fuel and nuclear industries today than on R&D for renewable energy or advanced vehicle technologies. For instance
Renewable Energy Policy Project
Advocacy and discussion groups on renewable energy options. Not terribly active, but occasionally updated