For instance, it is necessary to monitor wind speeds for at least one year before building a wind turbine (World Bank, 2008b: 8). The most attractive options have often been applications that are income generating and are linked to existing agricultural activities or agro/forest industries. Where customers are concentrated, it can be more economical to connect them to a small grid or a centrally located generating system, typically based on RETs, on a diesel generator or on a diesel-renewable hybrid solution.