Subject(s): Renewable energy sources in Developing countries. -- Power resources in Developing countries. -- Renewable energy sources. and Non-renewable energy -- Power from solar energy : photovoltaics, Water pumping, Refrigeration of vaccines, Lighting -- Heat from solar energy : distillation, Water heating,Drying -- Power from the wind : Wind energy conversion -- Water power : micro-hydro, Hydraulic ram pumps -- Biomass : Biogas as a fuel, Industrial combustion, Steam energy, Stirling engines