  We investigated the peculiarities of non-equilibrium charge configurations in
the system of two strongly coupled quantum dots (QDs) weakly connected to the
reservoirs in the presence of Coulomb correlations. We revealed that total
electron occupation demonstrates in some cases significant decreasing with
increasing of applied bias - contrary to the situation when Coulomb
correlations are absent and found well pronounced ranges of system parameters
where negative tunneling conductivity appears due to the Coulomb correlations.
