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Since 1 July 2007, all French consumers have been able to choose their electricity supplier. With the mechanism in place in France, all load extraction from and all injection into the transmission or distribution system must be allocated to a balance responsible entity (BRE).

The BRE mechanism is therefore one of the cornerstones of the opening up of the French electricity market. It enables all parties to operate on the electricity markets, while at the same time ensuring that the French power system remains balanced.

Currently, around 200 stakeholders are BREs. Each one of them ensures a balance between injections (inputs) on the one hand and extractions (outputs) on the other across its perimeter. This perimeter can cover:

  • extraction components: consumption sites across the Public Transmission System, consumption sites across the Public Distribution Systems, trades (block exchanges, exports, sales on markets, etc.), DSO power losses
  • injection components: power generation sites, trades (block exchanges, imports, purchases on markets, etc.).

For each imbalance settlement period (currently half an hour) and for each BRE, RTE calculates the difference between injection and extraction: this is calculating the imbalances.

To calculate the balance responsible entity imbalances and invoice for them accurately, RTE needs metering data from the distribution system operators (DSOs): this is the allocation process.

The "imbalance process" and temporal reconciliation

The balance responsibility allocation process is made up of two separate processes that are carried out one after the other:

The "imbalance process" is used to estimate BRE imbalances using consumption and generation data provided by the TSOs for each BRE before the index meters are read.

  • It is used to invoice BREs between M+1 and M+12

Temporal reconciliation is for correcting the distribution grid perimeters after the index meters have been read.

  • It is used to invoice BREs in Y+1 and Y+2

Roles entrusted to the DSOs

The DSO is responsible for checking the quality of data that it produces and sends to RTE. To do this, it is tasked with the following responsibilities:

Data exchanged between the DSOs and RTE for the "imbalance process"

As part of the allocation process, the distribution system operators and RTE exchange reference data and dynamic data.

For more information about sending reference data, click here
For more information about sending dynamic data, click here

Data quality is a fundamental consideration: the DSO is responsible for checking the quality of data that it produces and sends to RTE.

Simplified provision

Depending on your type of network and the sites connected up to it, you may be eligible for simplified provisions for sending your data to RTE.

Annual invoicing of temporal reconciliation

Once the index meters have been read, you must send RTE the data from profiled sites that have been "reconciled" according to the reading. This is the second step after the imbalances have been calculated: temporal reconciliation, which is invoiced to the BREs annually.

You send RTE:

  • the estimated reconciled consumption/generation load curves
  • before the 15th day of month M+14 for the month M
  • for each active BRE on your network

These load curves are calculated based on energies which use the indices which manage the period to be profiled. The procedures for producing these curves are detailed in chapter F of Section 2 of the balancing market terms and conditions.

Temporal reconciliation is invoiced in October of year Y+2 for the year-long period running from July Y to June Y+1.

The services provided by RTE to help you perform your tasks

To help you send the data needed for the allocation process, RTE provides you with a number of digital services.

Data that can be viewed, also available for download

Portals and MMI

APIs, for connecting your IT system to RTE's


For more information, contact your usual account manager or email

For any technical problems in communicating data, RTE has a hotline that you can telephone on 0810 80 50 50 or you can write to
Contract focus

Contrats focus

  • The client connected up to the network signs a "unique contract" with their supplier for a complete service covering the supply and transport of energy.
  • Remotely-read clients can also choose to sign a distribution network access contract with the distribution system operator directly and a separate contract with their supplier.
  • For supplier distribution system operator contracts, the supplier designates the BRE for the distribution system operator for clients to whom it supplies electricity and who are connected up to the distribution network.
  • The distribution system operator enters into a contract with the supplier’s BRE based on the rules governing the BRE mechanism.
  • Finally, the distribution system operator enters into a contract with RTE for the management of the BRE mechanism across its network, in order to formalise information exchanges (D1 appendix of the BRE rules).