Some also target a mix of farms, big villages and small towns all of which call for different technologies. In fact, rural electrification policies are shaped according to the various energy needs, resources and target groups. Electrifying the suburb of a major Indian city obviously poses problems that are different from those of a remote village in China. Remote or rural regions lacking electricity supply are often characterised by well identified challenges. They may lie at a reasonable distance from national or regional electricity grids (remote villages in the Amazon), may be difficult to access (far from urban centres with a difficult terrain such as large rivers or jungles), or may suffer harsh climatic conditions that render electrification through grid extension a perilous task. Rural communities are also often highly dispersed with a low population density and characterised by a low level of education, low load density generally concentrated at evening peak hours, and low revenues.