In accordance with the requirements of the Network Code on Capacity Allocation Mechanisms (CAM NC), entry and exit capacity at cross-border interconnection points (see appendix 8 of the TSC) is auctioned via the European capacity platform Prisma. In line with CAM NC, GTS offers the following standard capacity products at these interconnection points:
- Yearly capacity (per year for max. 15 gas years in advance);
- Quarterly capacity (per quarter for the 4 quarters of the next gas year);
- Monthly capacity (per month for the next month);
- Daily capacity (per day for the next );
- Within-day capacity
These capacity products are auctioned on the days specified in advance and laid down in the auction calendar.
The capacity to be auctioned not only consists of the available technical capacity, but can also include capacity that shippers want to offer in the context of Surrender of Capacity via GTS on the Prisma auction platform. As part of the Congestion Management Procedures, GTS offers Oversubscription & Buy Back (OBB) capacity at interconnection points experiencing contractual congestion.
In principle, the capacity available at the interconnection points is auctioned as bundled capacity as far as possible. Based on the capacity offered by the TSOs, the Prisma platform will determine the amount of capacity that can be bundled is specified on the Prisma platform. If one of two TSOs is offering more capacity than the other TSO, this capacity will be offered by PRISMA as unbundled capacity.
GTS offers interruptible capacity if all firm capacity at an interconnection point is sold out. Interruptible capacity is only offered as a daily product on a day-ahead basis. Interruptible capacity has a probability of between 0% and 15% of being interrupted and starting 2020 the tariff reduction is 0,01%.
For operational arrangements see NC Interoperability