Wireless sensor networks have world wide applications in recent years. These sensor networks consist of a large number of tiny small and low power sensor nodes. Wireless sensor network has very important applications in remote environmental monitoring areas. The one of the main issues about sensor networks is energy efficiency in communication and broadcasting information on network. In this paper, the author's present various energy efficiency schemes which are helps to extend the life time of sensor network's like clustering, routing and load balancing also introduces the deferent techniques of clustering in WSN (Wireless Sensor Network).