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Loss of 500 kV transmission line of Paiton-Grati 1 & 2 causes voltage instability in surrounding subsystem which may lead to further disturbance in the Jawa-Bali system. Minimization of the voltage instability can be handled by adding Flexible AC Transmission System (FACTS) devices, such as Static Synchronous Compensator (STATCOM) and Static Synchronous Series Compensator (SSSC). STATCOM and SSSC have the capability of dynamically controlling the power flow through a line. This paper aims to compare the performance of both devices to maintain system stability in the case of loss of 500kV transmission line. The performance of these methods is compared through the analysis of the bus voltage, the active power, and the rotor angle. As a result, this paper shows that the implementation of STATCOM is more stable instead of SSSC.