The mechanical realization of an open system as a potential and as power suppliers is obtained in this article. The potential is defined by the synchronization with respect to duration and by the reachability of the open system. The reachability is obtained from the open system energy transfer. The synchronization with respect to duration is set as synchronization of the duration with respect to development and the duration with respect to cycling; it is presented as mass interaction. The duration with respect to development is obtained from the serpent of the open system behaviour. The duration with respect to cycling is obtained from the similarity between an open system and its environment. The power suppliers are set as energy bids; these bids are defined by the mass interaction and by the transfer of energy from the open system.