Energinet.dk has sold two capacity agreements in a given point on a given gas day. The total capacity in a given point is 170 units.
The first 100 units are sold to shipper A on a firm capacity agreement and the next 100 units are sold to Shipper B with a split between 70 firm capacity units and 30 interruptible level-1-capacity units. Meanwhile, 30 units are sold to shipper C on a capacity agreement in the backhaul direction.
The interruptible capacity sold to shipper B would be interruptible level-2-capacity if no backhaul capacity was sold to shipper C. Likewise, if the backhaul capacity was sold to shipper C some time later, and the Energinet.dk did not expect to make this backhaul capacity sale at the time of the sale to shipper B.
If only firm capacity is available in 3 months and a shipper requests a one year capacity agreement, Energinet.dk offers a combined capacity agreement with 3 months’ firm capacity and 9 months’ interruptible capacity.
Energinet.dk receives nominations for a given gas day from both shipper A, B and C:
- Shipper A nominates 90 units on the firm capacity agreement (100 units).
- Shipper B nominates 100 units (Energinet.dk receives a combined nomination for both the firm (70 units) and the interruptible capacity (30 units) from shipper B).
- Shipper C nominates 10 units in the backhaul direction.
The hereafter following capacity check of the nominations received and the available and sold capacity in Energinet.dk’s system before matching then results in:
- 90 units from shipper A to its counterpart on firm capacity
- 90 units from shipper B to its counterpart 70 units on firm capacity and 20 on interruptible capacity level-1
- 10 units to Shipper C in the backhaul direction from its counterpart
The request for shipper B could have been 100, if shipper A had nominated 10 units less or shipper C had nominated 10 units more in the backhaul direction.
In any case, the shippers will only be allocated the above number of units by Energinet.dk, if the adjacent system’s operator has sent an equivalent or higher request for units from their counterpart. Accordingly, mismatch and reduction in accordance with the “Lesser of Principle” can also happen.
If shipper A renominates 100 units on its firm capacity, at a later point in time, then shipper A’s allocation will be increased to 100 and B’s allocation on its interruptible capacity will be reduced with further 10 units to 80 units. A shipper’s renomination on a firm capacity agreement can hereby push another shipper into interruption.