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In this paper suitability of applying graphics processing unit (GPU) based computing for electromagnetic transient (EMT) simulation of large scale power systems is demonstrated. As the network size increases there is a corresponding increase in simulation time with conventional central processing unit (CPU) based simulation tools. The paper shows that with a hybrid environment consisting of CPUs and GPUs, simulation time is much less compared to the CPU-only implementations. In this scheme the GPU is mainly used to do the computationally intensive part of the simulation in parallel on its built-in multiple processing cores, and the CPU is assigned for updating history terms and flow control of the simulation. The GPU-based approach is used to simulate a network with 117 nodes, and it is shown that the CPU-GPU based implementation takes less than half of the time taken by the CPU-only implementation of the simulation.