Localization is one of key issues in MANET. It provides information about coverage, deployment, routing, location service, target tracking and rescue. If high mobility among the mobile nodes occurs, path failure breaks. Hence the location information cannot be predicted. Here, the authors have proposed an Effective Localization based Optimized Energy Routing (ELOER) based on cluster and energy consumption model to provide location information of nodes based on trilateration method. Proposed approach consists of three phases. In first phase, cluster head is chosen based on energy level.