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.
Bids from small "non-standardised” BEs are ranked together. They can only be dispatched if a more expensive bid has already been activated. When dispatched, they are automatically dispatched at their maximum power, without guaranteeing that all operating conditions are taken into account, and within the limit of 100 MW per half-hour interval.
Classification and selection of standard bids
Standard balancing bids are transmitted by RTE to the European TERRE platform according to a process defined between the partner TSOs and specifying the standard bids which are not technically activatable.
Standard balancing energy bids are made anonymous and transferred by RTE identically, i.e: without any changes to their content.
The PP=C balancing need is also transmitted by RTE to the TERRE platform. It corresponds to the total P=C balancing need provided by RTE on the hour H preceded by 40 minutes.
The selection of the standard bids to be activated is carried out by the TERRE platform according to a common merit order ranking process according to:
- the balancing needs of the various participating TSOs and
- the residual capacities available at interconnections with neighbouring countries.
When RTE participates in the standard bid sharing process, RTE does not activate specific bids for P=C balancing reasons until it receives the P=C balancing need met by the TERRE Standard Product Bid platform.
A balancing order transmitted by RTE to receivers of orders contains:
- The power required
- Activation Time
- Deactivation Time It may be specified by RTE after the order is transmitted if the order is to be executed immediately.
For standard bids, balancing orders to be implemented on [H; H+1[ are transmitted 30 minutes before hour H.
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.
Both activations can be done in the same direction (two upward bids for example) or in opposite directions (one upward and one downward).
However, RTE cannot simultaneously activate an upward bid and a downward bid on the same BE.
When several orders are transmitted and fulfilling all of these orders is not feasible, the balancing service provider must respect the next order of priority, regardless of when the order is transmitted:
- Immediate implementation orders for system backup: these orders are transmitted to users connected to a specific system and with which an agreement has been established
- Order submitted by telephone
- Order submitted using the TAO system concerning specific bids
- Orders submitted using the TAO system concerning standard bids.