They have at least six CD's packed full of information available, as well as downloadable articles .. all in PDF format. There are also enough links to other renewable energy sites (photovoltaic and wind) to keep you busy for a long time. The links are located on the main page under "Renewable Energy Links". You'll also find that if you have specific questions, the magazine staffers are *very* willing and able to answer them .. or point you to sources where you can pursue answers with experts in the field. Enjoy!