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In this paper, the impact of renewable energy penetration to Thailand generation system is investigated from 2010 to 2030 by using scenario based analysis. Energy accounting model based on probabilistic method is used to calculate system indices and handle the balance of energy demand and supply. The baseline scenario is developed from Thailand Power Development Plan 2010 (PDP2010), whereas other possible scenarios, e.g., 10%, 20%, and 30% renewable energy, are simulated. Then, the impact is comparatively analyzed through indices, e.g., reserve margin (RM), fuel diversity, average cost, and average CO2 emission. With the obtained results, critical system impacts will be determined and used as a guideline for strategic planning and long-term preparation for Thailand power system.