A balancing bid can be activated for one of four reasons:

• Supply-demand balancing, known as P=C
• Reconstituting frequency ancillary services
• Reconstituting power margins
• Handling network congestion

Classifications and selections of specific bids

Specific balancing bids are selected for activation based on common merit order: bids meeting the balancing need at a given time are sorted respectively, ascending from the lowest price to the highest price and descending from the highest price to the lowest.  Specific bids received by RTE are continuously ranked.

If two bids have an equal price and equivalent technical characteristics, there are priority rules:

• A bid from a consumption BE takes priority over a bid from a generation BE.

• A bid from a renewable energy source or a cogeneration facility has priority over a bid from another generation BE: this is known as priority dispatch.

In addition, in some cases, certain bids are ranked in a specific manner:

• RTE may be required to categorise bids separately to meet specific needs, including the resolution of system congestion, the reconstitution of margins or frequency ancillary services, or the need to activate a bid in less than fifteen minutes (this includes BEs which participate in manual frequency restoration reserve or replacement reserve). These bids may therefore be out of merit order and may be retained to meet these needs where necessary.

• For bids transmitted by exchange point BEs, RTE will likely not dispatch a bid arriving by merit order if there is not sufficient capacity available on the interconnection.                                                      

• RTE may activate bids to carry out tests within the framework of provisions laid down in a capacity reservation contract or a regulatory provision, for example in the case of manual frequency restoration and replacement reserves. These activations for tests are out of merit order.

Balancing orders

A balancing order transmitted by RTE to receivers of orders contains:

• The power required
• Activation Time. If the balancing order is to be executed immediately, there is no activation time.
• Deactivation Time

For standard bids, balancing orders to be implemented are transmitted 12,5 minutes before activation time.

RTE is also likely to send cancellation orders if a dispatched bid ultimately is not to be activated. The order is transmitted no later than the mobilisation lead time of the bid if it is not fixed by a technical agreement for generation BEs.

After receiving a balancing order on a BE, the scheduling agent must submit a final dispatch schedule corresponding to the entity’s schedule taking into account the balancing order. This final dispatch schedule then serves as a basis for settlement of the balancing operations. If it is not transmitted, it is established by RTE according to the balancing order.

Technical materials used

Balancing orders are transmitted via the TAO application. In case of unavailability, they are transmitted by telephone.
The final dispatch schedules are submitted by the participants on the TOPASE application.

The user guides of these applications are available here: Participating in the balancing mechanism.

Simultaneous activation of a standard and a specific bid and prioritisation of orders

In accordance with the bid usage conditions, RTE may simultaneously activate a standard bid and a specific bid on the same BE.

If several orders are submitted by RTE and it is not feasible to implement all of the orders due to a contradiction between the orders or due to the fact that implementing one of the orders makes it not possible to implement one or several others, the balancing service provider gives priority to the following orders, by order of highest to lowest importance:

• Immediate implementation orders for the system backup
• Bids submitted by telephone, 
• Orders submitted using the TAO system and concerning specific bids,
• Orders submitted using the TAO system and concerning RR standard product bids. 

This order of priority takes precedence over the order transmission time by RTE to the balancing service provider.
RTE is implementing a process to limit these situations. Traceability allows RTE, where relevant, to provide the balancing service provider with the reasons that led to these situations.

Additional information

• Becoming a balancing service provider