The electrical conductivity of an equilibrium system of particles interacting according to a surface adhesion potential was studied by means of Monte Carlo simulations. Results for the conductivity in the region of the percolation threshold are reported as a function of particle volume fraction and temperature. The conductivity exponent mu was found to be 1.6+or-0.2, in agreement with experimental measurements on microemulsions but significantly different from the reported lattice value of about 2.0.