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This paper analyzing influence of distributed generation (DG) on transient stability of power system network operating parallel with large renewable energy resources (RES) power plant. The study is performed in hypothetical power system network envision in the future which contains a large number of DG. Network behavior when subjected to disturbance is compared with different level of DG penetration. The results are compared with the performance of the network without DG and RES power plant as a reference case. It can be concluded that addition of DG and RES power plant makes power system network more transiently stable. This integration enhances the power system network capability in handling more larger disturbances.