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In this paper, conventional control method has been developed for the design of Integral controller gain, applied to automatic generation control (AGC) in three-area hybrid power system after deregulation. The conventional three-area AGC system is modified to take into account the effect of bilateral contracts on the dynamics of automatic generation control. A three area deregulated power system with each area containing two Gencos and Discos with hybrid turbines have been considered for application. After deregulation, to describe bilateral contract for three-area AGC, Disco participation matrix has been considered. The performance of system is studied for different bilateral contracts cases.