Using wind-diesel complexes in autonomous electricity supply systems allows to substitute the expensive part of diesel fuel by renewable energy sources. The renewable energy sources, however, are unstable energy sources whose behavior differs much from the conventional ones. They rely in their functioning on nature resources, which affects the stable operation of the electric supply system. Therefore, analyzing the reliability of generation systems based on renewable energy sources is of immediate interest. The logical and probabilistic method has been suggested for evaluating the reliability of an autonomous wind-diesel complex considering the specifics and conditions of its functioning. The reliability of a wind-diesel complex located at the north of the Krasnoyarsk Krai is computed.