Comprehensive guide to renewable energy fundamentals! You won't find a more concise and comprehensive guide to learn the fundamentals of renewable energy including solar, wind, hydro, biodiesel, wood gas, and biogas! Get off the grid and make the most of the power you produce with creative ways to lower your energy use and cost. Energy expert and hands-on, off-grid homesteader , Paul Scheckel provides plans to build and maintain a variety of energy-saving and energy-producing equipment, ranging from thermosiphon solar hot water collectors to bicycle-powered generators, even a demonstration size biogas digester that's perfect for science fairs!