Abstract: Mobile Ad hoc Networks (MANETS) consists of distinct devices that communicate with the help of infrastructure created instantly. When these devices are used in the areas like battlefield, emergency and rescue operations, the battery power must be efficiently used to prolong the life of each device as human intervention is not possible in such areas. There are number of ways that are used to reduce the power consumed by the nodes in the network. In this paper, the three effective methods that reduce the power to considerable extent are seen. The three methods are given as: by using variable transmission power, by using power aware routing protocol and the power management technique. These methods deal with different layers like physical, network and MAC layers respectively.