Another organization renewable energy folks will be interested in is the Solar Energy Industries Association (SEIA). You'll find SEIA state organizations in almost every state in the union and a few in Canada.
SEIAs are the organizations specifically for solar practitioners, vendors, and others who are interested in moving the Solar industry forward. The SEIA leadership does a tremendous amount of legislative work and has been responsible, along with others, for the existing federal solar tax credits. the state SEIAs are no different. They have been in part responsible for the state incentives found around the country through helping to write state legislation. They also have a great JOB bank and a bunch of other great stuff.
Find them at: www.seia.org