Electrode potentials and current of an unit cell of CCEQ measured for sea water of Bay of Bengal and pond water are presented in Table . For this measurement same electrode pairs like, Zn -Zn, Al -Al, F e -F e and C -C, are used. It was previously stated that there is no point to use metal electrode. But, for an academic purpose metal electrodes are used for this study. We observe that power density of C -C electrode is 0.40 W m -2 which is very promising for this method. Though power density of C -C electrode is less than that of