aFRR, Automatic Frequency Restoration Reserve, Energy Activated (will be deleted, please read description)
Description
The dataset is replaced by the new dataset [aFRR Energy Activation](https://www.energidataservice.dk/tso-electricity/AfrrEnergyActivation).
This dataset will be deleted on **October 14, 2025**. The dataflow will be discontinued on September 12, 2025.
---
Activated aFRR, also called secondary reserve, is used to restore frequency to the normal band (49.9-50.1 Hz) after the primary regulation (FCR) has stabilised the frequency. The dataset shows the marginal price for activated aFRR.
NB: The data is continuously updated and includes data from the last 3 months. Therefore, data beyond this time frame is not included in the dataset and the field "Date From" should be disregarded, as it does not affect the dataset's content or validity.
**Caution**: The price data differs from the PICASSO calculated prices. The prices published by Energinet take priority and should be used in all cases.
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/)