Conductivity relaxation spectra of interpenetrating network conducting composites of polypyrrole (PPy) and poly(styrene-co-butyl acrylate) (SBA) have been analysed on the basis of coupling model developed by Ngai. The macroscopic activation energy obtained from coupling model using the stretch exponent beta compares favourably with the tunnel energy estimated from the overlapping large polaron tunnelling (OLPT) model.