  We propose a mesoscopic setup which exhibits strong and manifestly
non-Gaussian fluctuations of energy and temperature when suitably driven out of
equilibrium. The setup consists of a normal metal island (N) coupled by tunnel
junctions (I) to two superconducting leads (S), forming a SINIS structure, and
is biased near the threshold voltage for quasiparticle tunneling,
$eV\approx2\Delta$. The fluctuations can be measured by monitoring the
time-dependent electric current through the system, which makes the setup
suitable for the realization of feedback schemes which allow to stabilize the
temperature to the desired value.
