Frequency and FCR demand per 10 seconds

Volume needs of Primary Frequency Control (FCR) to be procured by Elia in order to ensure operational security in the system. The primary reserves are activated based on the frequency deviations monitored by Elia.为确保系统运行安全，Elia需采购一级频率控制（FCR）的容量需求。一级储备的激活基于Elia监测到的频率偏差。