Wireless Sensor Network (WSN) requires various power management protocols to reduce the energy consumption. But the lifetime of sensor network greatly depend on their battery. Radio irregularity and fading in multi-hop WSN also affect lifetime of a sensor. Various cluster-based schemes are discussed as a solution for this problem. The proposed schemes centering on the clustering of network for conserve the energy of a network. The performance of the proposed system is evaluated in terms of energy efficiency and reliability.