The present work deals with the up -scale double chamber microbial fuel cell (MFC) to generate electricity from wastewater. The experiment was performed to improve generation electricity from wastewater as the substrate using the MFC. There are two strategies for making large -scale MFCs for electricity generation and wastewater treatment: enlarging the size of an individual reactor and combining small MFC units as a stack cells. Present cells were constructed from locally available materials of clay pot . The performance of MFC was evaluated by characterizing the generated voltage, current, power and power densi ty. Large size MFC has given maximum voltage by 717 mV and COD removal 66.3%, while stack MFCs has given maximum voltage by 1185 mV and COD removal 75.5 %. Thus, this study has demonstrated that the MFC can be used for electrical energy generation and COD removal from wastewater with more efficiency and less cost.