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Nowadays the world is facing global warming as one of its main issues. This is mainly caused by a rise in carbon dioxide and other greenhouse gases concentration in the atmosphere. Flaring is one of the major causes, in 2017, 141 billion cubic meters of natural gas was flared. For archipelago nations like Indonesia, global warming have great negative impacts which include environmental degradation, health implications and economic effects. This study is intended to develop a feasible measure to conserve flare gases. The energy of the flare gas is converted into mechanical energy through thermal power plant. The properties of gas flaring were obtained from Pertamina, Plaju, Palembang. Two possible plant configuration scenarios were developed, simulated using Thermo-flow and the results were compared. Both configurations employ the combined cycle concept, where a Brayton cycle is coupled with a Rankine cycle. The main difference between the two configurations is that configuration 1 uses a Heat Recovery Steam Generator whilst the second uses common Heat Exchangers in-between the gas turbine and the Rankine cycle. The results show that configuration 1 would generate 29.18 MW whilst configuration 2 would generate 24.623MW.