Energy aware routing algorithms called Reliable Minimum Energy Cost Routing and Reliable Minimum Energy Routing (RMER) are proposed for wireless adhoc networks. RMECR defines the requirements of adhoc networks like energy-efficiency, reliability, reliability and prolonging the network lifetime. It consider energy consumption and the remaining battery energy of the nodes. RMER finds routes minimizing the total energy required for end to end packet traversal. RMECR and RMER both ensure reliability using hop by hop or end to end packet retransmission. Energy consumed by processing elements of transceivers, limited no of transmission allowed per packet, packet size, the impact of acknowledgement packet are considered in wireless adhoc network. We use an approximation algorithm for minimizing the network congestion.