Energy conservation is an important aspect regarding routing in wireless sensor networks. Single path routing protocols are not an optimum choice in maximizing network lifetime. In this paper an energy efficient multipath routing is proposed. A cost function is used in this multipath routing protocol that maximizes network lifetime using minimum energy path. Multipath routing helps in balancing the load and also reliability in data delivery is achieved. The protocol discovers a least energy path in terms of cost function by calculating node‟s transmission energy and residual energy. The cost function is used to find the next hop node through the path construction phase. A primary path and alternate path is discovered. When a node in primary path fails it takes an alternate path and transmits data. The node‟s transmission energy and residual energy are used to predict the next hop through the path construction phase. The proposed cost function in this paper achieves much higher performance than other cost functions and has minimum average delay. The remaining energy in the node is also conserved.

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