Mathematics has important role in every line of life, especially in welcoming the realization of SDGs. Therefore, we brought up the graf concept as the strategic step to provide electricity access to which is optimal and efficient by utilizing renewable energy source. Specifically, for several areas in Alor Regency, Nusa Tenggara Timur (NTT). We chose Alor region because based on data we obtained, number of people who can use electricity is still relatively low. This work is addressed to support Minister of Energy and Mineral Resoirce (ESDM) realizing Bright Indonesia Program (PIT),” explained Yudasril as Team Leader.