Decentralized electricity production from renewable energy sources offers greater security of supply to consumers while respecting the environment. However, the random nature of these sources requires us to establish rules for the sizing and use of these systems in order to make the best use of them. Hybrid renewable energy sources can effectively meet the electric energy needs of the University of Skikda's various structures. This study examines the financial viability of a hybrid renewable-based system that is off the grid and proposed to supply several campuses of the University of Skikda in Algeria with the electricity they need. In order to achieve this, HOMER software is used to optimize and simulate the system under consideration. The results obtained recommend using a system made up of a wind turbine, solar panels, a battery bank, and a fuel cell that can produce electricity at a levelized cost of 0.193 €/kWh.