Wireless Sensor Networks (WSNs) have attracted many researchers due to its wide range of application and benefits. Most of researchers take care about energy parameter of WSNs. To increase life time and for saving energy, Data aggregation plays very important role. Many data aggregation approaches are introduced but cluster-based data aggregation protocols are most popular because of its benefits. This paper address the unbalanced energy dissipation in cluster based homogeneous, reactive WSNs in which Cluster Heads (CHs) transmits data to Base Station (BS) via multi-hop, proposes an energy aware data aggregation.