Building an off-grid PV system in an unelectrified community is one of MENTARI’s objectives. It is considered the best solution for providing rural electrification. For this purpose, we selected Mata Redi and Mata Woga villages in Central Sumba as a demonstration project. This Feasibility Study for A Microgrid System in Sumba explains about this demonstration project and examines that least-cost energy delivery models can stimulate economic activities which are gender and socially inclusive, leading to increased income and reduced poverty within the community.