This paper presents a new control strategy for optimal energy consumption in microgrids based on forecasting and load shedding method. In islanded mode, only local generation resources are usable. In this mode, the availability of resources is very influenced by meteorological factors. In order to achieve a high availability of energy, microgrid has to satisfy high requirements on intelligent power management. The main objective of this study is to develop a control based on the forecast of production and the priority of loads to ensure high availability of electrical power for critical loads. A mathematical model for the proposed strategy is developed. The simulation of this model on Matlab Simulink for different cases of microgrid topology (sources and loads) shows clearly a high improvement of degree of availability of electrical power supply distribution in microgrid.