IGCC (International Grid Control Cooperation) Initiative

IGCC concepts


The IGCC is a cooperation between TSOs which deals exclusively with Imbalance Netting for automatic Frequency Restoration Reserves (i.e. to avoid counter activation of aFRR in different Control Areas) under residual ATC constraints at the borders to provide operational security. Its objectives are to lower the solicitation of aFRR, to strengthen the security of supply for each IGCC Member and to generate social welfare for the whole cooperation.


The basic principles of the aFRR-Optimization Process are the following:

  • Each IGCC Member calculates the aFRR-Demand of the Load Frequency Control Area (LFC-Area) to which the IGCC Member belongs.

  • The aFRR-Demand and Limits are sent to the aFRR-Optimization System in real time.
    • aFRR band limits.

    • Residual ATC constraints
  • The aFRR-Optimization System calculates in real time the Corrections whilst respecting the Limits, which correspond to the part of Import/Export exchanges that will fulfil the Demand of each IGCC Member and • The Corrections are sent back to the IGCC Members and are used as an input in the aFRR control process.

The Imbalance netting process may be illustrated as follow:

IGCC Cooperation Background


Since May 2010, all four German TSOs have launched the so-called Grid Control Cooperation (GCC) to optimize secondary control procurement and activation in German LFC–Area.

The Imbalance netting principles of GCC was then extended to other TSOs with common border with Germany, to define the so-called International Grid Control Cooperation (IGCC).

IGCC is composed, beginning of 2016, of 10 TSOs from 7 countries:

  • 50Hertz, Amprion, APG, CEPS, Elia, Energinet.dk, Swissgrid, TenneT B.V., TenneT G and TransnetBW

RTE Participation to IGCC


RTE plans to start to net its imbalances in IGCC on 16/02/2016.

The involved borders for RTE are the borders with actual IGCC members:
France-Belgium, France-Germany and France-Switzerland.

The residual ATC after Intraday Market is provided as the limits in real time.

There will be no decrease of the existing amount of control capacity in RTE control area, due to this cooperation.

RTE Volumes Exchanges with IGCC


The volumes of exchanged energy of RTE with IGCC can be found on the German publication platform at the following link: http://www.regelleistung.net/ext/data/?lang=en.

IGCC settlement Principles


The volumes of exchange energy of RTE with IGCC are settled according to the rules described in the linked document: Market Information on grid control cooperation and international development.

The financial profits of this optimization for RTE are integrated in the Adjustment Account (“compte ajustement-écarts”) and therefore benefit to all French market participants.