Book excerpt: Highly illustrated and practical, Microhydro is the first complete book on the topic in many years. Covering both AC and DC systems, it first introduces the important principles on which microhydro is based, including the advantages and disadvantages of using small amounts of water to generate power. Along with a glossary of microhydro terms, further reading and resources - including websites and commerical suppliers - Microhydro includes all the information a homeowner needs to start generating clean, off-grid, and independent power.