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In the recently deregulated electricity market, a more secure of power system operation is essential. One of the methods to avoid the risk of compromising power system instability is preventive control which often comes in the form of generation rescheduling. This paper attempts to solve transient stability preventive control problem by generation redispatch utilizing the Primal-Dual Interior Point Method (PDIPM) Non Linear Programming (NLP) Transient Stability Constrained Optimal Power Flow (TSCOPF). A linear cost model is derived to accommodate generation redispatch. Our simulation shows that the proposed method is able to solve the transient stability preventive control problem by rescheduling necessary active power generation.