It is following the increase in the population of the city of Lubumbashi on the one hand and the intensification of semi-industrial activity on the other hand that we deemed it appropriate to undertake a study on the estimation of the energy demand of the annex commune of the city of Lubumbashi. The choice of the annex commune was motivated by the fact that it is the belt of the city of Lubumbashi and is currently undergoing spectacular development in infrastructure and will therefore need a significant demand for electrical energy. The city of Lubumbashi is made up of seven municipalities which are: Lubumbashi, Kamalondo, Kenya, Katuba, Kampemba, Ruashi and the Annex commune. The growth rate over the last ten years of sampling is estimated at 42% and clearly shows that there is a need to know the demand trend curve in order to predict future energy needs. The objective of this communication will then be to estimate the energy demand of the Annex municipality. To achieve our objective, we started by mapping the said municipality by listing the different loads (houses, schools, churches, semi-industrial sector, etc.), so to assess future energy demand, we used the Bottom-up model.