The increasing number of smart applications based on energy management and inexpensive and standard MCUs are creating demand for actuators/sensor networks in the market which also include building automation, telemedicine, home and lighting. Wireless sensors network is a simple and economic step towards the deployment of control devices and distributed monitors. They avoid expensive retro fits required in wired systems. But there are some challenges and limitations associated with the wireless protocols faced by the application developers that continue to persist. Power limitation has been the greatest challenge faced in WSN. In this paper, we discussed various algorithms proposed to achieve power conservation.