Evaluating the Impacts of Priority Dispatch Rule on Renewable Energy Curtailment in Japan.

In this paper, impact of current priority dispatch rule on the demand and supply operation, the unlimited and uncompensated curtailment and the wholesale power market trading were analyzed. As a matter of the current priority dispatch rule, first is that the Japan's priority dispatch rule focus to maintain supply and demand mainly within the region. Second, Japan's electricity system can't afford to connect large amount of variable renewable energy because it focuses on individual supply-demand balance in each area and gives high priority of long-term fixed power sources. Furthermore, it is expected that the economic rational crossregional operation will be expanded through wholesale electricity market, but curtailment of variable renewable energy starts at zero yen. On the other hand, It is possible for long-term fixed power sources to supply electricity at a constant output without negative price risk. Furthermore, evaluation of curtailment prospects in FY2017 turned out that there is possibility that future restart of nuclear power plant is trigger of start of curtailment of variable renewable energy during low demand period in Kyushu area. There is possibility that current priority dispatch rule gives a disincentive to transit more flexible system in the market. It is necessary to discuss for improvement that enables economic curtailment through cross-regional real-time market, negative price etc. [ABSTRACT FROM AUTHOR]