UPC Renewables Indonesia initiate to develop Wind Farm Power in Timor System, East Nusa Tenggara, as planned in RUPTL 2021-2030. The main concern of this study is the frequency stability impact of this wind farm. In the existing system and based on development plan RUPTL 2021-2030, there will be several gas engine power plants in Timor System, namely Kupang Peaker and Kupang-2. Therefore, it is important to see the response of the gas engine when the power output of the wind farm fluctuates since the size of the power plant is quite big.