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Energy efficiency and long network lifetime has been of a great interest in wireless sensor networks. In addition to delivering data to the base station, a routing protocol must be energy efficient. An efficient routing technique is known as hierarchical routing based on clustering. In this paper, wireless sensor network is considered with a mobile base station. After clustering the nodes and selecting the cluster heads, the best location of the base station is determined based on the most efficient energy consumption for data delivery of cluster heads. In other words, the location of the base station for the next round is determined so that the minimum energy cost is imposed for data communication, in which we have prevented from data overflow with sending information through single hoping from all the CHs to the base station. Simulation results are provided to prove the efficiency of this technique.