The price or reliability of petroleum supplies, and pressures to reduce environmental pollution have increased the interest in renewable energy sources as an alternative to fossil fuels. Wind, solar, hydro and biomass are particularly suited for use with small-scale, decentralised energy systems. Those responsible for energy supply (government energy planners, development project managers or small business entrepreneurs) often face problems in deciding which energy source, and its conversion technology, is most appropriate for their specific situation, and where they can obtain the necessary equipment. This invaluable guide to small-scale energy equipment will provide some of the answers to such problems. The catalogue builds on both the 1979 edition of The Power Guide, and the equipment directory produced by the Technology and Development Group of the University of Twente in the Netherlands as training course material. The data has been comprehensively revised and updated on the basis of research carried out by members of the Technology and Development Group, members of Intermediate Technology in the UK, and Densitech bv of the Netherlands. The Power Guide will facilitate decision-making by providing guidelines for the selection of the most appropriate renewable energy source as well as providing information on hundreds of products from almost 500 manufacturers and suppliers in more than 40 countries throughout the world, covering the following areas: micro-hydro, hydraulic ram and river current turbine products; windpumps and wind generators; biomass pre-treatment, combustion and steam systems, and gasifiers; solar photovoltaic and thermal equipment. The information is broken down into chapters each with an introduction with guidelines on equipment selection and the possibilities and constraints of using that energy form. This is followed by manufacturers' data which contain key information on the equipment. Section guidelines are also included on internal combustion engines, and biogas and ethanol equipment. South manufacturers represent more than half of the entries. Essential reading for development workers.