MANET is a collection of wireless mobile nodes that are able to communicate with each other without using infrastructure or any centralized administration. The Mobile nodes act as a host node as well as router node. A MANET is self-configuring, infrastructures network of mobile device connected without wires. In MANET every device is free to move in any direction means the source node can be send packet or data any destination easily in any network. In MANET each node cooperate and dynamically establish and maintain routing in network. Routing is very complex in these network due to moving nodes in any direction. Efficient routing protocol makes MANET reliable. Energy efficiency is a major problem of mobile Ad-hoc network as mobile nodes will be powered by batteries with limited capacity, insufficient source of energy and are difficult to replace or recharge. In MANET, Energy efficiency is an important challenge which leads to proposal of an Energy Efficient Enhanced AODV Routing Protocol that reduces delay, overhead, increases packet delivery ratio and consumes lesser energy compared to AODV. In this paper, a review of different protocols based on Energy Efficient Routing is done.