The challenges in developing renewable energy for electricity in Indonesia are indeed still very complex. In terms of policy, energy use development in Indonesia is mostly still based on the least-cost electricity. The problem of high technological cost used to generate electricity from renewable energy when compared to electricity generation from fossil energy sources takes part burdening the development of renewable energy in Indonesia. This study aims to determine electricity demand projections and fulfillment of using renewable energy (RE) in South Sulawesi. Electricity demand projection is obtained from the time series model based on historical data. The results show that from 2017 to 2025 the public sector is the highest percentage increase (78 %), while the highest nominal increase is the household sector (971 GWh). In total, there is an addition of 2,285 GWh (43%) of electricity demand in South Sulawesi. Renewable Energy available in South Sulawesi has been able to meet the target of fulfilling electricity demand and the energy mix with the most optimum type of RE is Hydropower at a cost of USD 168,242,725 and the fulfillment of the electricity demand meet from Renewable Energy are 52% from the total electricity demand at year 2025.