Renewable energies have an important place today and yet still a future ahead. Photovoltaic (PV) pumping systems remain the best solution for access to water in dry areas, especially in remote regions. In this paper we shall review modeling of water pumping cost using PV systems in some dry areas i.e. Kebili, Medenine, Gabes and Tozeur in south Tunisia. The goal is the elaboration of a simple and operational model for every site, which allows calculating the production cost of a m(3) of pumped water, taking into account only the annual water need and the total manometric height. The model indicates that average pumping cost greatly depends on the amount of water supplied and on the total manometric height for both unconfined aquifer and groundwater. The production cost is on average 542 millimes and 801 millimes, respectively for unconfined aquifer and groundwater, that is to say an average increase of about 47% for the 4 sites of Kebili, Medenine, Gabes and Tozeur.
