:::

臺灣能源期刊論文全文

臺灣能源期刊第4卷第2期內容

出刊日期:June,2017

題目
非核家園與政府再生能源推廣目標下之碳稅與最適電源組合分析
Title
The Optimal Power Portfolio under Carbon Tax and Renewable Energy Promotion
作者
王京明、林祐民
Authors
King-Min Wang, Yo-Min Lin
摘要
本研究採用財務學上之資產組合理論中的平均數-變異數分析方法,透過台電公司2003至2014 年的成本資料,導出在目前電源配比限制及政府2025年再生能源推廣目標下的電源配比效率組合前 沿,計算目前的應有的效率配比以及在2025年能源推廣目標下的效率配比,並導入效用曲線以求出 最適電源配比,分析課徵碳稅對效率及最適電源配比的影響,並評估碳稅稅率的改變的減碳效果。 研究結果顯示台電公司可以經由調整目前電源組合配比,以進行發電成本與財務風險間的抵換,在 2025年再生能源推廣目標下,效率能源配比的風險將小於目前的效率配比,CO2排放量亦可略為降 低,但發電平均成本上升。在課徵碳稅的情況下,由於燃煤價格既使含碳稅仍然相對較低,課稅 後燃煤用量依然增加,故課徵碳稅額度若不超過每噸CO2達3,000元水準將難以達到減碳的效果,此 外,也必須配合再生能源配比大幅增加以及再生能源成本的降低,才能達到較佳的減碳效果。上述 結論顯示政府在制訂碳稅政策時應考量碳稅的課徵對於不同電力資源間成本替代效果的影響,並且 必須同時規劃好積極擴大再生能源發電的相關配套措施。
關鍵字
碳稅、電源配比、資產組合理論、再生能源、平均變異分析
Abatract
In this study, we apply the mean-variance analysis method in the portfolio theory of finance, and use the data of cost information of Taiwan Power Company from the period of 2003 to 2014, to calculate the efficient portfolio frontier for current generation mix and for the 2025 renewable energy promotion goals. Furtherly, we introduce the indifference curve from the utility theorem to derive the optimal generation mix. In addition, in accordance with the global trend of the issue on the energy saving and carbon reduction, this study also analyzes the impact of carbon tax on the efficient generation mix and the optimal electricity portfolio. The results show that Taipower can adjust the energy mix to trade-off the cost and risk of power generation. Under the 2025 official renewable energy promotion target, the risk of efficient electricity portfolio is less than the risk of current efficienct electricity portfolio, and the CO2 emission will be reduced, but the average generation cost will rise. In the case of carbon tax implementation, the coal price is still relatively lower than the natural gas under the proposed tax level. Under the carbon tax coal consumption increased, the carbon tax levy cannot achieve the effect of carbon reduction. Therefore, in order to achieve a better carbon reduction effect it is necessary to make the substantial increase in renewable energy promotion goal and the decrease in renewable energy generation cost. The above conclusions show that the government should consider the impact of carbon tax on the cost substitution effect among different power resources, and must also make relevant supporting program to expand and diversify the renewable energy generation at the same time.
Keywords
generation mix, portfolio theory, renewable energy, Mean-Variance Analysis, carbon tax