Hydroelectricity is the world's largest -- and cleanest -- source of renewable energy. But despite lively interest in renewables generally, there is an information vacuum about the smallest version of the technology dubbed 'the simplest, most reliable and least expensive way to generate power off grid'. Highly illustrated and practical, Microhydro is the first complete book on the topic in a decade. Covering both AC and DC systems, it covers principles, design and site considerations, equipment options, and legal, environmental, and economic factors.