The research presents four unique configurations of a combined energy system for Vietnam's island settlements, incorporating biomass-based biogas facilities, photovoltaic panels, lithium-ion batteries, and converters. Off-grid systems are specialized solutions for areas without grid access or with unstable grids. The role of smart meters in this. In the Power Development Plan VIII with a vision to 2050, Vietnam's power sector has labored to develop new resources such as solar and wind energies in an effort to build and enhance the nation's power system. A technical and financial model for the construction of a hybrid grid-connected. The present work is an endeavour to develop a sustainable and dynamic energy demand-supply model using HOMER Pro energy software in a specified off-grid rural site in Vietnam. In the event that the solar panels produce more electricity than the usage, the battery will. This report is made possible by the generous support of the American people through the United States Agency for International Development (USAID).