Influences of dimethyl carbonate (DMC) plasticizer on ionic conductivity, dielectric permittivity and electrical modulus formalism of methyl cellulose (MC)-based polymer electrolytes have been studied. The room temperature electrical conductivity as measured by impedance spectroscopy shows that a methyl cellulose film has a conductivity of ~10-10 S cm-1. In this study, other than KOH ionic dopant, DMC plasticizer is also added to the polymer with the aim of enhancing the electrical conductivity of the polymer. The highest room temperature conductivity of the plasticized sample is ~10 -5 S cm-1. The plot of log σ versus 103/T for the highest conducting sample obeys Arrhenius rule indicating that the conductivity occurs by thermally activated mechanism.