Nowadays, energy management is one of the current research topics in power systems by means of controlling the system control variables to balance the abnormal load demand and fault conditions. In such cases, the optimal power flow was considered for determining the energy balancing in past research activities. In this research, the Whale Optimization Algorithm (WOA) is applied for providing the optimal power flow. It extends our previous research on rescheduling and congestion management of generators. Here, the performance WOA algorithm is checked with the IEEE test networks such as (a) IEEE 30-bus and (b) IEEE 50-bus test systems. The optimal power flow control by the change in real power of generators with minimization of total congestion cost. The overall process was carried out with MATLAB development tool to verify the power system outcome. The simulation results demonstrated that the WOA is effective in testing and it proves that it is one of the best congestion management (CM) scheme.