aFRR - DK1 Skagerak (Discontinued, please read description)

This dataset is no longer updated. For data after August 2020, please find data here [aFRR, Activated Automatic Frequency Restoration Reserves](https://www.energidataservice.dk/tso-electricity/AfrrActivatedAutomatic) or [aFRR, Automatic Frequency Restoration Reserves, Nordic capacity market](https://www.energidataservice.dk/tso-electricity/AfrrReservesNordic) Automatic Frequency Restoration Reserves (aFRR), also called secondary reserve, is an automatic 15-minute power control. It shows amounts and prices in Western Denmark. The data is historic, and only includes aFRR through Skagerak (Norway). All aFRR for DK1 was under normal circumstances delivered over Skagerrak 4. The agreement with Norway on purchases of aFRR and FCR to West Denmark expired in 2019. Previously aFRR was called Load Frequency Control (LFC). The reserve is active over virtually the entire operating day and fulfills three functions: * It releases activated FCR. * It deals with minor imbalances that are too small for regulating power activation. * It restores the agreed balance towards Germany. In addition, activation of aFRR differs from FCR since it is not triggered directly by frequency fluctuations at the individual plants. It is activated through an automatic control signal sent from Energinet via the balance responsible party. For further information, please see: * [Balancering og systemydelser](https://energinet.dk/el/balancering-og-systemydelser/) * [Balancing and Ancillary Services](https://en.energinet.dk/electricity/balancing-and-ancillary-services/)