How much gas does GTS call off when initiating a WDBA?

The volume called off during a WDBA is calculated as follows: The difference between the predicted end-of-hour value of the SBS and the border value of the dark green zone. If applicable, the part of previous WDBA calls that has not yet been delivered is included in the determination of the volume of a subsequent WDBA. If the predicted imbalance has reduced compared to the imbalance of the previous hour, no WDBA call will take place.

FAQ

Balancering regime

Yes, traders must also be aware of the balancing regime and must be able to receive and send all electronic messages related to it. Although traders are unlikely to experience imbalances in their portfolios, this cannot be ruled out, for example as a result of incorrect portfolio management or an error in nominations with or by counterparties.

If you wish to become a provider on the gas exchange, you must meet the criteria set by ICE Endex. For an overview of these criteria, please refer to the ICE Endex website. Once you are authorised to trade on the ICE Endex exchange, this is sufficient to offer flexibility in the run-up to a balancing action. GTS does not impose any additional requirements.

In principle, your POS will never be reset. WDBA's affect the POS: when a WDBA is executed, called volumes are settled pro rata with the POS of the parties responsible. The POS of shippers who, at the time of the balancing action, have a POS that is opposite to the SBS (long vs. short) will not be affected.

This cannot be predicted in advance. A WDBA is conducted when the (forecast) position of the SBS gives cause to do so.

Every 10 and 15 minutes past the hour, the end-of-hour forecast for the SBS is calculated. If the outcome at 10 minutes past the hour gives cause for a WDBA, an advance notice is published on Gasport and a Request for Quote (RfQ) is posted on the ICE Endex trading screen. The advance notice and the RfQ provide an estimate of the volume to be called on the ICE Endex spot market based on the most recent information.

If the predicted SBS at 15 minutes past the hour still gives rise to a WDBA, the advance notice on Gasport is updated and another RfQ is placed on the ICE Endex trading screen.

If, in the 21st minute, the SBS forecast for the next hour (still) gives rise to a WDBA, an order will be placed on the ICE Endex spot market.

Based on the estimated transport load (based on the programmes submitted by the Shippers), the size of the zones per hour is announced at least two hours before the start of the gas day. These hourly values are not changed after they have been published.

No, you are only obliged to apply damping when you transport gas intended for delivery to domestic consumers.

The volume called off during a WDBA is calculated as follows:

The difference between the predicted end-of-hour value of the SBS and the border value of the dark green zone.
If applicable, the part of previous WDBA calls that has not yet been delivered is included in the determination of the volume of a subsequent WDBA.
If the predicted imbalance has reduced compared to the imbalance of the previous hour, no WDBA call will take place.

Due to the processing time required, the POS of xx:15 is published at approximately xx:20. For all 5-minute values, it takes approximately 5 minutes to calculate, process and publish the values.

The accountable POS for the entire hour (xx:00) takes into account allocations at exit points to distribution networks (DSB). These allocations become available around xx:13 for the past hour. If a shipper does not have any DSB exit points in its portfolio, the accountable POS (available around xx:20) is equal to the near-real-time POS that becomes available around xx:05. Please note both indicate the value of the POS at xx:00.

Yes, it is possible; a POS is created for each portfolio. Multiple portfolios for a shipper result in multiple (independent) POSs. These must be balanced separately.

No, GTS only has an SBS forecast for the next hour.

Yes, a POS is also determined for a wheeling portfolio, which may be influenced by a WDBA.

Yes this is possible.

Yes

Yes, an Excel file containing the zones for the current gas day can be downloaded from the website.

The WDBA announcement in Gasport is displayed immediately as soon as the SBS forecast gives reason to post an RfQ on ICE Endex. The announcement is displayed on all screens in the Dispatching menu item. The following information is displayed:

GTS WDM Order Forecast at: <xx:05>/<xx:10> LET - GTS <buys>/<sells>

Product: <remainder of day> (as from 1-1-2026 the only balancing product)

Amount per hour: <value> MW/h

Total amount: <value> MWh

SBS forecast value: <+/-value> MWh