aFRR - automatic Frequency Restoration Reserve - Former R2


R2 Non CIPU Pilot Project - 2016-2017

Elia has performed in 2017 a pilot project R2 non-CIPU together with Actility, EDF Luminus and Next Kraftwerke. The aim of this pilot project was to investigate whether small and decentralised flexibility and demand side management are capable of delivering automatic Frequency Restoration Reserves (aFRR).

On June 3th 2016 Elia organized a workshop where the objectives and organization of the project where explained to the interested stakeholders.

For more information, please consult the documentation of the R2 non-CIPU Workshop :

A description of the pilot project and its conclusions are presented in the report here below. The report includes also the results of an assessment of the implications of the Transfer of Energy for aFRR.

Based on the results of the pilot project Elia believes that it is desirable that the aFRR market is opened to non-CIPU flexibility. Therefore Elia will develop a new market design for aFRR including a technical and economic evaluation of the implementation of Transfer of Energy. The proposal of design shall be presented and consulted to stakeholders in the course of 2018.


Pilot project: delivery of downward secondary control by wind farms - 2015

The massive integration of renewables, like solar and wind generation, in the electricity grid represents a challenge for keeping the balance between power consumption and generation. In the future it is expected that there will be fewer conventional units running during periods with high renewables infeed. Today these units deliver the majority of balancing services to the TSO. Hence, a further diversification of resources delivering balancing services to the grid is required.

This pilot project therefore investigates the technical capability of wind farms to provide downward secondary control (Automatic Frequency Restoration Reserves) to the electricity grid. This will facilitate the further integration of renewables in the grid and as such contribute to the fulfilment of the European 2020 energy and climate targets.

The results of the pilot are very promising for a future participation of wind farms in the secondary control market in Belgium. The capability of wind farms to perform fast regulation of their production, with relative high accuracy, has been demonstrated. The pilot project has identified some technical and market related aspects that must be further investigated to facilitate the commercial participation of wind farms in this market in the future.

In the framework of this project, the Enercon turbines of the Estinnes wind farm of WindVision technically contributed, for a period of about 2 months, to the delivery of secondary control power to the Belgian grid by continuously changing the active power output of the turbines according to a set-point defined by Elia. Eneco, being the balancing responsible party of the wind farm, provided nominations for the available secondary control capacity on the wind farm to Elia. The project set-up was such that there was no interference with the balancing market.