Tinggi Island is located off the South Bangka Regency coast, with an electricity peak load of 7,5 kW supplied by the 40 kW diesel power plant. One of the problems in the provision of electricity in Tinggi island is difficulty in delivering fuel process. This problem causes expensive fuel prices and a limited amount of fuel. This research aims to analyze the technical and financial of a hybrid 16 kW biomass power plant with the existing diesel power plant. The method used in this research is to estimate the energy generated by the diesel and biomass power plant, the fuel required, and the payback period by calculation. From the study, the diesel power plant will produce 1,999.53 kWh of electricity per month with the need for diesel oil of 1,939 liters. Meanwhile, the biomass power plant will produce 2,077.53 kWh of electricity per month with a biomass requirement of 2,078 kg. Based on financial analysis, waste pellets, risk husk, and wood charcoal as biomass power plant’s fuel have good feasibility with a payback period between 1.9-2.6 years. In contrast to the three types of biomass, palm shells are not economically feasible to use as fuel because they are more expensive than diesel fuel.