Wireless Sensor Network (WSN) contains large number of tiny sensors that can be used as an effective tool for gathering data in diverse kinds of environments. The ultimate aim of the taxonomy is to outline characters of energy conserving routing protocols and compare their performances. Research workers have recommended many protocols such as LEACH, DEEC and TEEN. Clustering technique is used to conserve energy using multi hop communication of sensor nodes within the same cluster and performing data aggregation and fusion to reduce the amount of transmitted data to the base station.