Polyether sulfone (PES)-graphite-expanded graphite (ExGr) conducting hybrid composites are prepared by solution blending route by first dissolving PES in dichloromethane. The binary composites exhibit percolation threshold at 10 wt;graphite. The electrical conductivity of binary composites below 10 wt;graphite lie in the insulating range whereas above that composition, due to network formation between graphite particles, insulator to semiconductor transition occurs. Above 30 wt;graphite,saturation in the electrical conductivity has been observed due to completeness in the network formation. In order to understand the effect of second conducting high aspect ratio filler such as nanographite, PES-7 wt;graphite in chosen. The percolation threshold in the hybrid composites has been found to be at 0.05wt;sonicated expanded graphite. The overall concentration of conducting fillers is dramatically reduced as one could obtain the electrical conductivity equivalent to that of PES-20 wt;graphite by adding only 1 wt;ExGr in PES-7 wt;graphite. The impedance analysis shows that graphite nanosheets are found predominantly in the intergraphite space. The composites are characterized by SEM and TEM analysis.