The e-book describes the small wind sector, which includes energy plants up to 100 kW, whose young world market still offers many uncertainties and obstacles to deal with. The e-book opens with a description of the types of existing systems and their structure, so as to provide a clear picture of what you can find on the market. Then the profitability of a small wind project is treated, with particular reference to the technical parameters (wind resource condition of the installation site, the power curve of the turbine, …) and economic variables (costs, incentives, …) to be evaluated in determining the bankability. A comprehensive overview on the situation of the world market is offered, analyzing the strengths upon which the growth of the sector; in particular, small wind feed in tariffs in the countries of the world are widely described and the future trend of the small wind market too. Great attention is paid, finally, on current issues about the process of certification of turbines and on possible solutions which, if undertaken at the international level, would ensure better safety of the market and greater consumer protection.