Potato waste containing high content of organic matter constitutes for a considerable proportion of food waste and a major part of it is in solid forms.Microbial fuel cell (MFC) is a technology that can convert organic waste into electricity.If MFC is considered for application in potato waste treatment, how to enhance hydrolysis of the potato waste to maintain high levels of organic substrates for electrogenic bacteria from the beginning is very important.Cooked potato may get hydrolyzed easier than raw potato and thus affects the overall performance of MFC.Accordingly, in this study, the effect of the presence of cooked potato on the MFC performance was investigated using four MFC reactors supplied with solid potato having different boiled potato ratios (0, 48.7, 67.3 and 85.6 %).The performance for electricity generation was evaluated based on current density generation and electrochemical behavior.The removal efficiency for potato as well as the changes in organic matter composition were assessed according to total and dissolved chemical oxygen demand (CODCr), volatile fatty acids and fluorescence excitation emission matrices.Maximum current density of four MFCs reached 160.1, 181.0, 253.9 and 243.3 mA/m2, respectively.A Higher removal efficiency for COD was also obtained for all four MFCs, with the final removal being 86.6, 83.9, 84.1 and 86.3 %, respectively.Columbic efficiency reached 53.5, 70.5, 92.7 and 71.1%, indicating that larger percentage of COD was used by bacteria for electricity generation by increasing the boiled potato ratios.As the boiled potato ratio increased, the current density obviously increased and the time period needed for obtaining maximum current density shortened.The behavior of COD also indicated that mixing of boiled potato shortened the initial hydrolysis time of the potato waste.