英文摘要 |
Fossil fuel price volatility is one of the key factors impacting energy security. Taiwan relies upon imported energy for more than 90% of its total energy usage, making it highly vulnerable and deeply influenced by the uncertainty of international fuel markets. Therefore, Taiwan's energy investment decision is confronted with risk from fossil fuel prices. To understand how to set up electricity portfolio planning under risk and uncertainty, this study adopts a Mean-Variance Analysis of portfolio theory and employs the expected utility theorem to explore the optimal electricity portfolio for Taipower Company, the resultant expected return and risk of the generation system, and the condition of CO2 emissions. The results indicate that, under the case without renewables, using more nuclear energy in the portfolio can increase the expected return, but at a cost of slightly higher risk. In the case with renewables added, the results demonstrate that using more renewable energies has the advantage of hedging against the fuel price risk while maintaining the same expected return level. Therefore, if generation efficiency and cost of renewables can be improved by technological progress, then the return of the electricity portfolio can be increased and CO2 emissions can be mitigated significantly. Our study contributes to the risk management of electricity portfolio planning and to the advantages of employing renewables in the energy generation mix. However, the risk matter in the study is limited to the fossil fuel price risk in financial markets. This is not total energy risk as related to the conventional concept of energy security, but it should be taken into consideration by a multi-dimensional analysis in a future study. |