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Prisma

In accordance with the requirements of the European Network Code on Capacity Allocation Mechanisms (CAM NC), GTS offers transmission capacity through PRISMA, the joint capacity booking platform of the major European network operators.

The CAM NC prescribes five standard capacity products to be offered by the European TSO’s at the cross-border (virtual) interconnection points. These products are:

  • Annual capacity (gas years)
  • Quarterly capacity
  • Monthly capacity
  • Daily capacity:
    - Day Ahead (DA, next gas day) capacity
    - Within Day (WD, same gas day) capacity

These capacity products are auctioned according to a pre-published auction calendar set by ENTSOG. Capacity products for the monthly, quarterly and annual auction are published on the PRISMA website prior to each auction.

For each type of product, PRISMA determines, based on the amount of capacity offered by the TSOs, how much capacity will be offered as bundled or unbundled capacity. Firm capacities on both sides of the border are bundled to the maximum. The remaining capacity, which cannot be bundled, is offered as unbundled capacity. Unbundled capacity is offered in a separate auction that runs parallel to the bundled capacity auction.

DA and WD capacity is offered every day (including weekends and public holidays). WD capacity consists of the remaining firm capacity of the DA auctions on PRISMA.

The first WD bidding round starts at the previous gas day at 7:00PM (LET). This auction will remain open for 7.5 hours until 2:30AM (LET). The following auctions start on the hour and remain open for 30 minutes. The capacity of a successful bid can be used from 3.5 hours after the close of the WD auction.

After the auction has closed, the shipper can submit nominations to GTS for this acquired capacity from 10 minutes after the auction has closed. For the first WD auction the shipper can therefore nominate from 2:40AM (LET).

The WD capacity tariff is based on the daily capacity tariff and a WD factor. This factor is determined by the number of hours the capacity is available: WD factor = number of hours/24.

Interruptible capacity, transfers of capacity and Surrender of Capacity (SoC) are not supported in combination with the WD capacity product.

An overview of all (virtual) interconnection points where capacity is offered through PRISMA auctions can be found in the TSC (Appendix 1 Network Points and Prices).

Auctions and creditworthiness If you make a bid during an auction, it will be checked, among other things, whether your credit space is sufficient to be able to purchase the desired capacity. It is therefore important that you ensure that you have sufficient credit space prior to the auction(s) concerned. If you have any questions about this, please contact the GTS Customer Desk. More information on creditworthiness can be found here.

More information about the auction process can be found in the aforementioned CAM NC as published by ENTSO-G.

FAQ

Tariffs are part of the TSC tariff appendix.

The cost per month for Yearly product can be calculated as follows: cost (Euro) = booked capacity * reserve price * number of days in month / number of days in year (= 365 or 366). The reserve prices depend on entry/exit and storage/non-storage and can be found in Appendix 1 of our TSC

The cost per month for Quarterly product can be calculated as follows: cost (Euro) = booked capacity * reserve price * number of days in month / number of days in quarter (= 90, 91 or 92). The reserve prices depend on entry/exit and storage/non-storage and can be found in Appendix 1 of our TSC.

The cost per month for Monthly product can be calculated as follows: cost (Euro) = booked capacity * reserve price. The reserve prices depend on entry/exit and storage/non-storage and can be found in Appendix 1 of our TSC.

The cost for Day product can be calculated as follows: Cost (Euro) = booked capacity * reserve price. The reserve prices depend on firm/interruptible, entry/exit and storage/non-storage and can be found in Appendix 1 of our TSC.

The cost for Within-Day product can be calculated as follows: Cost (Euro) = booked capacity * reserve price * number of hours booked / number of hours in day (= 23, 24 or 25). The reserve prices depend on entry/exit and storage/non-storage and can be found in Appendix 1 of our TSC.

Only interruptible capacity can be booked via an emergency procedure.