A decentralized electric energy supply system, based on a combination of renewable energy plants using solar, wind and biomass, supplemented by a traditional diesel generator and supervised by a management unit is proposed. This system, with high local production contents, is well adapted for regions where it is costly and/or practically difficult to supply by the conventional centralized way by means of a nation-wide grid. In the aim of increasing the overall system power efficiency and reduce costs, two types of semiconductor power converters cooling systems, which have a limited volume, are of low cost and could work in an aggressive environment are presented. The south Algerian Sahara, with daily high temperatures (but nightly cool) and sandy soils, is an example of such an environment. The proposed forced air and liquid cooling systems use the soil as a final heat sink to naturally cool down the circulating water. The forced liquid cooling system has been realized and tested on a power converter in the power systems laboratory of the department of electrical engineering. An improved intelligent distribution system for a village is also presented and the measurement and control unit hardware and software have been realized, implemented and tested. The global objective of the work was to optimize an Algerian village electrical energy consumption system with respect to profit, efficiency, reliability, distribution network stability, consumers protection, and environmental impact.