Tariff information

Starting point for all tariffs is the annual tariff. Annual tariffs apply to contracts with a flat capacity profile for a period of 12 months. An annual contract may start in any month. Long-term contracts may be concluded in multiples of 12 consecutive months. Contracts may also be concluded for shorter periods of time, for example for a few hours per day, one single day, one single month or several days or months.

A monthly contract always expires on the last day of the calendar month concerned.

Our entry and exit tariffs are mentioned in appendix 1a and 1b of the TSC.

Tariff System

If a shipper books capacity for a period of less than 12 months, the so-called ‘monthly factors’ apply to the tariff. The monthly factor is a percentage of the annual tariff and may differ from month to month.

If a shipper books capacity for a period of less than 12 months, the tariff for the whole period forward transport capacity is booked for, is calculated as follows:

  • The sum of the monthly factors for the individual months (which can never exceed 100%) is multiplied by the annual tariff, or, if this is lower,
  • (81.25% plus 3% of the number of winter months plus 1.5% of the number of spring and autumn months together plus 0.75% of the number of summer months) multiplied by the annual tariff.

For the standard capacity products (quarter, month and day) offered on PRISMA, the correct monthly and daily factors are included in the tariffs.

For backhaul capacity, a monthly factor of 1/12 times the annual tariff applies for each month.

FcFs capacity, both firm and interruptible (if firm is sold out), can be requested for any period as long as it relates to a continuous period and to flat capacity throughout the period. Profile bookings and combined firm and interruptible bookings are not supported by PRISMA. Because the monthly factor system is used, the above-mentioned restrictions can lead to higher costs.

At the shipper’s request, GTS can retrospectively apply the monthly factor system to the combined bookings. Such a request from the shipper will only be granted if the bookings have been made on the same day for the same network point and, of course, in the same direction.

If these requirements have been fulfilled, the capacity is divided into horizontal capacity ranges and the monthly factor system is applied to each individual range. Also see the graph below.

Exceeding capacity

A capacity overshoot, for which a surcharge is applicable and effected, occurs when per day the contractual entry capacity and/or exit capacity is exceeded by more than the operational margin of 2% per hour. Only the highest capacity overshoot per gas day will be charged.

The amount of the surcharge is based on the difference in value between the booked capacity and the actual capacity used multiplied by the valid monthly factor multiplied by the annual network point tariff (transport tariff + balancing tariff + quality conversion tariff valid at the network point concerned).

Neutral gas price

The neutral gas price is used, among other things, for the settlement of off-line allocations.

The neutral gas price per day is defined as the weighted average TTF price on the ICE ENDEX for all transactions made during the day concerned, the day before and two days before the day of delivery.

The neutral gas price is published on the ICE ENDEX website.

This link brings you to the ICE ENDEX neutral gas price report. Scroll down until you find the neutral gas price.

Starting Tuesday June the 27th of 2017, a change in the procedure of the neutral gas price is processed: if no neutral gas price is published by ICE ENDEX for a particular gas day, GTS will use the day-to-day reference price of PEGAS. We will use the DRP index that you can find through this link, TTF DA for weekdays, TTF SAT for Saturdays and TTF SUN for Sundays.

In parallel, GTS is working on a structured and formalized solution: see this news item.


View all frequently asked questions


  • The quarterly tariff can be calculated as: quarterly tariff = quarterly factor * yearly tariff

    • Quarterly factor:
      * in case of FORWARD FLOW depends on the quarter of a gasyear (Oct – Oct):
         - 0,6 for Q1 (October, November, December)
         - 0,75 for Q2 (January, February, March)
         - 0,3 for Q3 (April, May, June)
         - 0,225 for Q4 (July, August, September)
      * No BACKHAUL product
    • Yearly tariffs can be found in TSC Appendix 1a en 1b

    The costs for a quarterly FIRM capacity booking can be calculated as:
    cost (€/quarter) =  booked quarterly capacity (kWh/h) * quarterly tariff (€/kWh/h/quarter)

    No Interruptible products.

  • The costs for a yearly FIRM capacity booking can be calculated as:
    cost (€/year) =  booked yearly capacity (kWh/h) * yearly tariff (€/kWh/h/year)

    No Interruptible and/or backhaul products.

  • The Within Day capacity can be calculated as follows: the Daily capacity tariff times the Within Day factor.

    The Within Day factor is determined on the number of hours the capacity is made available(runtime): number of hours/24.

  • ‘Neutral gas price being the most recently published as referred to in the Transport Conditions for Gas, article’ means the neutral gas price (as defined in the Transport Conditions for Gas, article as published near real time by ICE ENDEX at 06:00 of the gas day that the bids are being placed.

  • The daily capacity tariff can be calculated as follows: daily factor * monthly factor * yearly tariff

    • Daily factor is always 1/30
    • Monthly factor:
      * In case of FORWARD FLOW depends on month:
      - 0,3 for December, January, February (winter months)
      - 0,15 for march, April, October, November (shoulder months)
      - 0,075 for May, June, July, August, September (summer months)
      * In case of BACKHAUL
         - Monthly factor is 1/12 for all months
    • Yearly tariff can be found on our website

    The costs for a daily FIRM capacity booking can be calculated as: 
    cost (€/day) =  booked daily capacity (kWh/h) * daily tariff (€/kWh/h/Day)

    If the booking is INTERRUPTIBLE, then a discount of 30% will be applied: 
    cost (€/day) =  0,7 * booked daily capacity (kWh/h) * daily tariff (€/kWh/h/Day)