九州地域における太陽光発電の出力抑制に関する施策の経済価値と分配構造

抄録

In the context of a feed-in tariff (FIT) scheme, this study examines the economic implications of solar power curtailment in Kyushu, Japan, a region with a high penetration of solar photovoltaic power. By defining the potential market value of curtailed electricity, it analyzes how economic benefits and burdens are distributed among renewable producers, retailers, conventional generators, and consumers. Two utilization scenarios—daytime load creation and battery-based time shifting—are compared. The merit-order effect is minimal in the former scenario and is much less than battery cost in the latter scenario. These results indicate that under current institutional and cost conditions, benefits tend to concentrate among specific stakeholders, while consumer burdens persist. The policy implications include the introduction of separate metering and low-priced market mechanisms for curtailed electricity, as well as compensation schemes to ensure a fair allocation of benefits across stakeholders.