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Below you will find the answers to the most frequently asked questions to ONTRAS by their shippers. For further questions please do not hesitate to contact us personally.

Market area merger

Please note that the information given is non-binding and preliminary. The transmission system operators are currently working on the implementation of the market merger project. Until the start of the Trading Hub Europe market area, changes may therefore still occur to the information contained in the information given above.

Since when can the balancing groups of the new Trading Hub Europe market area be used?

For capacity bookings with a term until 1 October 2021, the existing GASPOOL balancing groups are still available on PRISMA or RBP and can be used. New capacity contracts that will be concluded with a term from 1 October 2021 can be assigned to the balancing groups of the Trading Hub Europe market area directly on the capacity booking platforms probably starting from the annual auction on 5 July 2021.

Note: It should be noted that only the balancing groups of the Trading Hub Europe market area will be implemented in accordance with the mapping list that have been assigned to ONTRAS known GASPOOL balancing groups. If mapped balancing groups that were previously assigned to the NetConnect Germany market area shall be used further, they must be communicated beforehand via the ONTRAS customer portal

What about the existing capacity contracts with the term after 1 October 2021?

Transport customers have to take over the responsibility for the exclusion of capacities out of the GASPOOL balancing groups and inclusion them into new Trading Hub Europe balancing groups via the ONTRAS customer portal. This is expected to be possible from 5 July 2021.

What impact does the market area merger have on existing network points?

Due to the merger of the market areas, the current market area interconnection point Steinitz will be inapplicable, so that no more capacity can be booked beyond 1 October 2021.

Where can the technical capacity per network point from 1 October 2021 be found?

The data is published in the ONTRAS transparency tool (Link Transparency Tool ( and on the ENTSOG Transparency Platform (ENTSOG - TP).

Where can I get more information about the merger of market areas?

Further information on market area merger can be found on the websites of the market area managers GASPOOL Balancing Services GmbH (GASPOOL) and NetConnect Germany GmbH & Co. KG (NCG) as well as the on the website GERMANY – ONE MARKET AREA. It is an offer of eleven transmission system operators in Germany and currently existing two German market areas.

Capacity booking

Prerequisites for capacity booking at ONTRAS

The preconditions for capacity booking at ONTRAS can be found in the section Gas Transport.

How do you register for bookings in the ONTRAS grid?

The registration should be done online via the respective capacity booking platform:

  • PRISMA: for all network points except the GCP GAZ-SYSTEM/ONTRAS - or/and
  • RBP: for GCP GAZ-SYSTEM/ONTRAS from 6. July 2020 onwards.

More information about the registration process can be found in the section Gas Transport.

Which documents are necessary for registration?

When do the auctions for firm and interruptible capacities at market area and cross border connection points as well as at storage points take place?

How can capacities be acquired at the network point where the capacity allocation process is not an auction process?

Firm and interruptible capacities at grid points, where capacity is not allocated via auction (industrial customers, production and biogas facilities), are marketed via first-come-first-served (FCFS). At the connection points of this type of bookings are possible up to 1 hour before the beginning of the contract.

Are capacities by ONTRAS offered as bundled capacities?

ONTRAS bundles all firm capacities at market area and cross border connection points according to NC CAM. Interruptible capacities are not bundled by ONTRAS.

Where do you find information about capacities and flows in the ONTRAS grid?

Free capacities as well as nominations and bookings are published on the transparency tool of ONTRAS.

Can interruptible capacities be converted into firm?

Interruptible capacities or capacities with interruptible parts can be upgraded into firm capacities with less interruptible parts during the bid submission in the auction process on the respective capacity booking plattform.

Can unbundled capacities been converted into bundled capacities?

At interconnection points unbundled capacities with a duration of a month or more can be converted into bundled capacities during the auction. The conversion function on the respective capacity booking platform can be used for this.

Does ONTRAS offer competing capacities?

No, there are no competing auctions for the ONTRAS grid.

What is the emergency process if bookings on PRISMA are not possible?

Capacities can be requested via form or mail to capacityontrascom and dispositionontrascom if the respective capacity booking platform is not available. The capacities will be allocated to the best ability of the transmission system operator but without any guarantee. The request for capacities has to be submitted 3 hours before the start of the planned gas transport for capacity bookings at interconnection points and storage points. At connection points to end customers, production and biogas facilities the request for capacities has to be submitted 1 hour before the start of the planned gas transport.

From 6 July 2020 onwards capacities at the network point GCP GAZ-SYSTEM/ONRAS are marketed on the capacity booking platform RBP (Regional Booking Platform).

Capacity marketing on 6 July 2020:

The first auction on RBP will be the yearly auction for firm capacities at 9:00 a.m., the second auction - the Day-ahead auction for firm capacities at 4:30 p.m. Thus, the capacity products with the contract duration from 07 July 2020 06:00 a.m. can be booked on RBP according to the ENTSOG auction calendar.

The regulatory background of the change is the decision of ACER (European Union Agency for the cooperation of energy regulators) as of 6 August 2019 (Decision No. 10/2019 on the selection of a web-based booking platform to be used by TSOs for the offering of bundled gas transmission capacity).

How can firm Within-Day capacities be booked?

Firm Within Day capacities can be booked either via Auction or via First-Come-First-Served (FCFS).

In case of a booking via auction, the uniform price algorithm is used. In the course of the FCFS procedure, capacities are allocated according to the chronological order of requests.

Which lead-time has to be considered for firm Within-Day-bookings?

A lead-time of 4 hours has to be considered at cross border and market area connection points. At storage points, the lead-time is 3 hours and at connection points to industrial customers, production and biogas facilities there is a lead-time of 1 hour

How is firm Within-Day capacity charged?

For firm Within-Day capacity, an hourly fee according to the ONTRAS price list is charged. Hereby, the short-term multiplier 2.0 is applied. For storage network points, also seasonal factors are applied

How can interruptible Within-Day capacities be booked at the network point, where capacities are allocated via auction?

Interruptible Within-Day capacity at the network points, where capacities are allocated via auction, can be booked by means of an over-nomination.

The precondition is that firm capacities are fully booked and that a balancing group was communicated to ONTRAS.

What is an over-nomination?

An over-nomination is a nomination, which exceeds the corresponding capacity included in the balancing group or sub-balancing account.

If firm capacities of the above mentioned network points in the desired flow direction are fully booked, interruptible within-day capacity can be booked by means of an over-nomination.

If the capacities at the network point in the desired flow direction are not fully booked for the period of over-nomination, a capacity overrun would be created for the difference to the capacity included in the balancing group or sub-balancing account.

How is the customer informed about the possibility of over-nomination?

The information about the current possibility of over-nomination is made available in our Transparency Tool in the "Booking Degree" tab by means of a traffic light display. 

What is the lead time for over-nomination?

The lead time for over-nomination is two hours.

Is it necessary before booking interruptible Within-Day capacities via over-nomination to include capacity into a balancing group?

No, the prior inclusion of capacity into a balancing group is not necessary for the booking of interruptible Within-Day capacities via over-nomination.

What if a customer sends an over-nomination and then sends a re-nomination reducing the values down to zero more than two hours before the first transport hour?

With submission of an over-nomination at a fully booked network point, a capacity contract will be concluded. A re-nomination does not affect this capacity contract.

How is interruptible Within-Day capacity charged?

For interruptible Within-Day capacity (over-nomination), an hourly fee according to the ONTRAS price list is charged. Hereby, the short-term multiplier 2.0 and the discount factor for interruptible capacity are applied. For storage network points, also seasonal factors are applied.

Where is the current price list published?

The latest price list is published in the download area on ONTRAS website. 

Do the fees for long-term bookings retrospectively change once new tariffs are published?

When new tariffs come into force at the beginning of a calendar year, the charges for existing bookings are also adjusted. If a contract is affected by this adjustment, ONTRAS grants the customer the right to terminate the existing capacity contracts in accordance with the General Terms and Conditions for Network Access.

Are secondary trades affected by the BEATE regulation?

With the assignment of secondary deals the short term multipliers are applicable. For example, if a quarterly product is bought via secondary trade out of a yearly contract, the multiplier of 1.1 will be applied for the quarterly product. The original yearly contract still has the multiplier of 1.

Due to the contractual relationship between the shipper and the transmission system operator, the short term multiplier does not apply for transfer of use.

When does the BEATE short-term multiplier equal to 2.0 apply to a capacity booking?

Auction: when booking capacity in a Within-Day auction.

FCFS: when booking capacities for the current gas day or when booking capacity for the following gas day after 6 p.m. (D-1).


What are the preconditions for nomination?

Nominations are possible after a successful communication test. This includes an agreement on the message format and the communication path. Successful nomination processing requires capacities in the balancing group.

How long does it take to successfully implement a communication link?

The implementation of the communication connection can take up to 10 working days.

Which formats does ONTRAS offer for nomination?

ONTRAS offers the following nominationformats:

Edigas XML (in accordance with the current version, which is published on
Edifact (in accordance with the current version, which is published on

Which communication paths does ONTRAS offer?

The following communication paths are used by ONTRAS:

AS2 (until 01.02.2018)

Which network point ID can be used in the nomination?

The following network point IDs can be used:

IDs published on PRISMA
A bilateral agreement is also possible

At which points are nominations required?

Nominations are necessary for all market area and cross border points as well as network points to strage facilities.

Where can you find the ID of the network point?

The network point ID is published on following pages:


Which role has ONTRAS in the single-sided nomination process?

ONTRAS is the active TSO at all interconnection points.

How to get the information regarding the renomination restriction?

ONTRAS sends a CHACAP message at the request of the balancing group manager.

What is the emergency process, if the standard communication path fails?

If the standard communication path fails, the nomination can be carried out via nomination portal or in coordination with the dispatching center.

What is the lead time for nominations?

The nomination can be carried out with a lead time of two hours to the next full hour.

Are Day-Ahead and Within-Day capacities subject to a re-nomination restriction?

There are no renomination restrictions for Day-Ahead and Within-Day capacities according to KARLA 1.1.

Invoicing and technical quantity evaluation

Is it possible to view billing data in the ONTRAS-portal? 
ONTRAS offers the possibility to view the billing data in the password-protected area of the portal. After the successful registration in the ONTRAS portal, it is possible to view, to download or subscribe to the time series and documents, depending on the account type. Please note, that ONTRAS provides the billing data voluntarily. The data provided during the regulatory market processes are legally binding.

What are the deadlines for providing invoicing-relevant data?
ONTRAS always makes every effort to provide the invoicing-relevant data with the greatest care and as early as possible. The respective regulatory deadlines are mandatory for providing invoicing-relevant data.

Does ONTRAS provide gas quality data?
On request, ONTRAS provides benchmarks. This data provides an overview of the gas composition of selected types of gas at entry-points. This helps the users to get information about the gas quality in the respective region. Once a month ONTRAS will publish the gas quality information in the portal.

Is the billing data calibrated?
The gas-quality-reconstruction-system provides billable and calibrated gas properties for different points in the ONTRAS grid, which will be used for the energy quantity determination. The procedure is approved by the Physikalisch Technische Bundesanstalt (PTB) and supervised by the responsible calibration offices. A copy of the certificate can be provided on request.

What actions does ONTRAS take in case of a failure of the data measurement or data retrieval at a network connection point?
According to the requirements of the DVGW worksheet G685, an estimate will replace the data which is missing. As the creation of an estimate for customers with a volatile profile in gas consumption is a complex process, the creation of this estimate will be conducted upon best efforts and abilities and under the consideration of additional information.

How can the user and ONTRAS exchange information about modifications at the measuring device or the meter?
ONTRAS offers the possibility to exchange information about modifications via mail to Furthermore, the user is able to enter the meter readings directly in the ONTRAS portal. However, this data adjustment is only possible in case of control readings. Changes of the master data are not possible. The master data of the measuring device is also published in the ONTRAS portal.    

What is a capacity overrun?

A capacity overrun occurs, when the allocated quantity exceeds the capacity brought into the balancing group.

When does the capacity overrun start?

The time at which the capacity is exceeded begins at the beginning of the hour in which the allocated quantity exceeds the capacity brought into the balancing group. The capacity overrun either ends at the end of the gas day or when capacity, in the amount of the capacity overrun, is brought into the balancing group. If within this period the input capacity is exceeded to an even greater extent, the greater capacity overrun shall be taken into account for either the rest of the gas day or until capacity in the quantity that led to the capacity overrun is brought in.

What is the difference between a capacity overrun and an interruptible Within-Day booking via over-nomination?

Over-nomination:Network point is fully booked in the desired flow direction and at the respective point in time and the customer nominates more than booked

Capacity overrun: Network point is not fully booked in the desired flow direction and the respective point in time and customer nominates more than booked.


How is a capacity overrun charged?

A capacity overrun is charged on an hourly basis. The respective tariff is based on the price list and includes the short-term multiplier according to BEATE as well as a special charge according to our Network Access Conditions (Part STCT)


The answers given in this FAQ list have been written with reasonable diligence and to the best of one’s knowledge according to the current status. Nevertheless, ONTRAS Gastransport GmbH is not liable for the information given on this page to be correct, complete or up-to-date. The information on this page is legally non-binding information. Please be aware that using this information is at the customer’s own risk.