Due to wide range of applications, low cost, small in size, low power, and self-organizing behavior, wireless sensor network is a popular subject in research community. Wireless sensor network node has low energy, due to this, energy consumption of node during data aggregation plays major role in wireless sensor network. Routing protocol with large overhead of data aggregation is not feasible for wireless sensor network. Routing protocol with low energy consumption in sensor network is, therefore, a challenging task. Clustering mechanism for routing has many advantages over hierarchical routing therefore clustering techniques are becoming an active branch of routing technology in WSNs.