Banana is an industrial crop of Thailand. It is easy to find and all parts can be used. Once bananas have been harvested, the rest of the plant is wasted. The authors are interested in utilizing the unused parts of the banana plants. This project is to study how fermented banana stems can be used to generate electricity. The solution of banana stems is used to find which solution can produce the most electricity. The findings found that the 9 days fermented banana stems provide the most electricity. using this kind of electricity is to connect with machine or LED lights and it showed that the level of electricity up to the electrical circuits, especially the compound circuit.