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...Objectives review basics of small hydro systems illustrate key considerations for project analysis introduce retscreen model minister natural resources canada what do provide electricity central grids isolated remote power supplies but also reliability photo credit robin hughes pns very low operating costs reduced exposure to energy price volatility system description projects is not universally defined size related just electrical capacity whether or high head typical flow runner diameter micro kw m s mini mw types type grid run river massachusetts usa off civil works pg e national group impact hydropower institute no water storage varies with available oregon from lower firm reservoir higher year round significant damming usually required frontier technology...