  IIt is shown that in a bilayer excitonic superconductor dissipative losses
emerge under transmission of the current from the source to the load. These
losses are proportional to the square of the interlayer tunneling amplitude and
independent on the value of the input current. The case of quantum Hall bilayer
is considered. The bilayer may work as a transmission line if the input current
exceeds certain critical value. The input current higher than critical one
induces Josephson vortices in the bilayer. The difference of electrochemical
potentials is required to feed the load and it forces Josephson vortices to
move. The state becomes non-stationary that leads to dissipation.
