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Since wireless sensor networks (WSN) as ad hoc networks do not have infrastructures and their topologies change dynamically, network nodes should be able to take suitable decisions without needing to know the network topology. One of these decisions is selecting the appropriate policy for service distribution of the whole network. The method of service distribution in the network is uniform by default. Therefore there may be some nodes in the network that provide service and there is less or no demand for them. So, based on the default attitude, energy and power consumption are high and since WSN are sensitive to the energy and power consumption, this is undesirable. In this study, a self-organised system for service placement and substitution in WSN is presented. By utilising this method, nodes can act automatically in delivering a service. Therefore the nodes that have no service request will be automatically omitted in the network. By utilising the proposed method of this study, the energy and power consumption of a wireless sensor network can be reduced by more than a half.