Hybrid micro-grid systems are a novel technology which is spreading worldwide and can represent a possible solution to the electrification issue, as deployment of these hybrid plants can be an optimum way to fully exploit renewable resources and meet local energy demands. In Tunisia, although access to electricity is guarantee, clean energy is not widespread at national level; however, RESs are abundantly available, hence the project developed wants to investigate the feasibility of a biomass and photovoltaic energy system located in a rural town in the central-western region of Tunisia, called Meknassy. This work gives, firstly, a worldwide overview on technical aspects and favourable environment of micro-grids.