リアルオプション法による固定価格買取制度の分析と新たな制度の設計に関する研究

摘要

A feed-in tariff (FIT) obligating a power transmission and distribution company to procure renewable energy in fixed time and price began in 2011. However, economic burden becomes heavy since the renewable energy levy increases in proportion to the amount of electric energy consumption. Also, a renewable energy introduction is delayed since power producers wait until the end of certification period of the FIT to gain a profit by decreasing the costs of solar power generation system. Therefore, we focus on 10MW solar power generation business in Tokyo and this paper aims at easing the economic burden at FIT and at stimulating an investment. We evaluate an optimal certification period and an original policy using a real opt ion analysis. Simulation results proved that1year certification period is best and the original policy is better than the FIT in terms of cost performance, which is represented with investment rate [%] divided by the renewable energy levy [yen/kWh]. These results showed that we could mitigate the economic burden and stimulate an investment by adopting the original policy with1year certification period.%わが国では2011年に生じた福島第一原子力発電所の事 故により火力発電所の稼働率が大幅に上昇し，電力料金高 騰ゃC02排出量の増加等,様々な問題が生じている.そこで C02をほとんど排出せず，かつ普及量が2倍になると20%価 格が下落する傾向にある太陽光発電システム"の普及を目 的として，2012年に固定価格買取制度（FIT)が始まった.FIT とは再エネを用いて発電された電気を，国が定める固定価 格で一定の期間送配電事業者に調達を義務づけるものであ る.買取りに要した費用は，使用電力に比例した再エネ賦課 金という形で，国民が負担するシステムとなっている.