Two of humans' most significant problems are power scarcity and improper waste management. Humans rely primarily on fossil fuels to generate energy that is non-renewable and will deplete in time. In addition, improper waste management pollutes the environment continuously. Common bio-wastes such as used cooking oil have the potential for electricity generation. When added to a bacteria-rich mud, the biomass of the used cooking oil can be converted to accessible and clean energy. These pieces of information led to the development of a device that would utilize bio-wastes in producing energy. 

           

                    An MFC is a device that converts bio-waste to energy, using chemical energy released by bacterial anaerobic respiration for electrical energy. Multiple mini MFCs were stacked together to enhance the effectiveness of MFCs in energy output. Three treatments were used using different substrate concentrations. Three trials were done, the first trial started after 12 hours, and the subsequent trials were recorded after a 3-hour interval. An observation guide was used to collect data systematically, and Purposive data sampling was used to select ten respondents to evaluate the rate of acceptability in terms of functionality, durability, and efficiency.

           

              Results show Treatment 1 with the highest average voltage produced and Treatment 3 with the highest current and power output produced. Therefore, Treatment 3 was the most effective treatment regarding the highest power output. The device was effective in energizing LED light bulbs and charging mobile phones. However, using one-way ANOVA, it was found that there is no significant difference between the voltage produced and the substrate concentration, but there is a significant difference in terms of current. In addition, the evaluation of the device by the respondents was analyzed through weighted means, and the device was then rated as Highly Acceptable in terms of functionality and efficiency and rated Acceptable in durability.