System Operation Area

System Operation Area

The primary work of the System Operation business entails developing and monitoring technical network codes, evaluating activities related to gas quality standardisation, developing and maintaining existent Common Network ­Operation Tools (CNOT), the ReCo System for gas, and the maintenance and continuous development of ENTSOG’s Transparency Platform (TP) including ­activities referring to REMIT. At present, System Operation comprises two main working groups: Interoperability (INT WG) and Transparency (TRA WG).


Transparency Structure

The energy market liberalisation process, aimed at securing a genuine, well-functioning, open and efficient internal market in gas, has significantly changed the gas transmission business and increased the need for transparency. In this respect, specific obligations for gas TSOs were introduced through Regulation (EC) No 715 / 2009, which defines the basic transparency rules, further specified in Chapter 3 of Annex I (and its amendments).

The network codes have been developed to provide rules and procedures to reach an appropriate level of harmonisation towards efficient gas trading and transport across gas transmission systems in the EU, increasing data publication requirements.

Regulation (EU) No 1227 / 2011 and its Commission ­Implementing Regulation (EU) No 1348 /2014 introduced additional publication and reporting obligations to the ­market participants, aimed at supporting market ­monitoring, fostering open and fair competition in wholesale energy markets. These obligations are also dealt with in the ­Transparency Area in ENTSOG.

Group Structure

The Transparency Working Group (TRA WG) is supported by the REMIT & UMM Kernel Group and in 2017 also by the Tariff Data Publication Taskforce.

ENTSOG Transparency Platform (TP)

ENTSOG’s TP provides technical and commercial data on the gas transmission systems, which includes ­interconnection points and storage connections, LNG facilities, distribution networks, final consumers and production facilities. The current version of ENTSOG TP was launched on 1 October 2014. It was developed with the aim of improving transparency, user friendliness and data publication capabilities. It is a powerful tool providing the means for ­ENTSOG’s members, associated partners and observers to fulfil their data publication obligations (see Chapter 3, ­Annex I, Regulation (EU) No 715 / 2009). ­ENTSOG received strong support from many stakeholders with regards to TP functionality and the information provided therein.

ENTSOG Transparency Platform (TP)
Released Functionalities and Improvements ­During 2017
  • Implementation of a new section for tariffs on the TP fulfilling the obligations ­resulting from the Tariff ­Network Code.
  • Implementation of a supporting tool which enables TSOs to provide tariff information fulfilling the requirements set for this publication.
  • Improved TP performance and response times, ­optimisation of TP database.
  • Improved TP help section with tutoring videos for ­capacity indicators, the upgraded tariff section, ­physical flow data, export wizard and general introduction of the TP and the search possibilities.
  • The TP User Manual was updated based on the above tariff-related functionality updates.
  • Introduction of full-text point direction labels (entry, exit) as a module of the TP Data part, to make it ­easier for TP users to understand the legends in the recently viewed items.
Released Functionalities and Improvements ­During 2017
  • Display of Pipe-in-Pipe situations: Improved visualisation of Pipe-in-Pipe points on TP
  • A new page called “Actual interruptions”, displaying “Unplanned interruption of Firm Capacity” and ­“Actual Interruption on Interruptible Capacity” in a ­format focused on displaying the most recent i­nterruption information was added.
  • Improved visualisations on unlimited interruptible ­capacity.
  • Data processing indicator, providing information to stakeholders about the data processing and TP ­publications.
  • Data publications for planned points, to enable ­transparency on planned or future potential points, mainly related to capacity information.
Usage Statistics
TP visits
TP Pageviews
TP Downloads
Updated tariff section: Standardised Table

The updated tariff section includes all parameters required by the Tariff Network code: commodities, applicable tariffs (firm and interruptible) including various parameters such as seasonal factors, and discounts.

The tariff section is divided into two main parts: tariff part and simulation costs.

The tariffs are published in local currency and the calculation into EUR is done by the TP based on the daily exchange rate of the European Central Bank.

All tariff data can be downloaded, like all other data on the TP, via the Export Wizard.

The tariff data published before December 2017 is available as an archive which can be found in the Export Wizard ­section.

Since tariff data is not published on daily basis, an ­additional Data Entry Platform for Tariffs (DEPT) was introduced ­enabling TSOs to enter their data, perform syntax checks and publish it on the TP without any change within their internal IT system.

TP Usage, Stakeholder Involvement and Data Publication

ENTSOG and TSOs work closely together to achieve the highest quality and comprehensiveness of the data ­published on the platform. To satisfy and serve the market expectations of data quality and transparency, an internal monitoring process has been established to facilitate the joint efforts of ENTSOG and its members. This process is continuously evaluated and updated, to keep up with the constant changes in functionalities and reporting ­requirements.

Besides TSO publications, ENTSOG is also supplying the European Commission and ACER with customised reports for specific tasks. In 2017, this entailed extensive work on reports to ACER in relation to their monitoring obligations for application of CMP measures and CAM  NC and data ­exports to EC in the context of the Quo Vadis study.

In 2017, ENTSOG executed two TP Satisfaction Surveys, to get a better understanding of user satisfaction with TP and providing an additional forum for receiving TP user input. Since less than 20 users participated in these surveys¹ , the results cannot be considered representative. However, ­ENTSOG did receive many valuable suggestions and these were discussed in the Transparency Working Group and ­prioritised for processing. It was also decided to implement a link to a “standing TP survey” directly on the TP, to make it easier for stakeholders to share their feedback.

REMIT Activities

Regulation on Energy Market Integrity and Transparency (REMIT)

Regulation (EU) No 1227 / 2011 (REMIT) establishes rules prohibiting abusive practices affecting wholesale energy markets and providing more transparency regarding price-relevant (inside) information. It provides for the monitoring of wholesale energy markets by the Agency for the Cooperation of Energy Regulators (ACER) in close collaboration with national regulatory authorities. The goal of REMIT, through strong cross-border market monitoring, is to detect and avoid market manipulations and to facilitate the completion of a fully functioning, interconnected and integrated internal energy market.

Commission Implementing Regulation (EU) No 1348 / 2014 stipulates the information that shall be reported and defines the rules to be followed by the market participants with ­regards to their REMIT reporting to ACER.

ENTSOG’s Activities as RRM

Since 2015, ENTSOG has been a Registered Reporting Mechanism (RRM). On behalf of gas TSOs, ENTSOG ­reports fundamental data to ACER with regards to the capacity and use of facilities for the transmission of natural gas, including planned and unplanned unavailability of these facilities, as defined in Article 9 (1) of Commission Implementing ­Regulation (EU) No 1348 / 2014.

The ENTSOG reporting system was developed according to the provisions of Commission Implementing Regulation (EU) No 1348 / 2014 and other supportive documentation issued by the Agency with regards to REMIT. Since 7 October 2015, ENTSOG has been reporting the following set of aggregated fundamental data to ACER, for each TSO that is publishing data on the ENTSOG TP:

  • Aggregated day-ahead nominations
  • Aggregated final re-nominations
  • Actual physical flow
  • Technical capacity
  • Available firm capacity
  • Contracted firm capacity
  • Total interruptible capacity
  • Available interruptible capacity
  • Contracted interruptible capacity
  • Planned interruption of interruptible capacity
  • Actual interruption of interruptible capacity
  • Planned interruption to firm capacity
  • Unplanned interruption to firm capacity

ENTSOG submits the required information to ACER as it was received on the TP.

As to the data reporting performed by ENTSOG on behalf of gas TSOs, ENTSOG provides the following information to its members:

  • Segregated access (per TSO) to report files submitted to ACER Reporting Information System for Applying REMIT (ARIS)
  • Segregated access (per TSO) to return receipts received by ENTSOG Reporting system from ARIS
  • Daily report (per TSO) on the status of files reported to ACER

As part of the REMIT Reporting process, ENTSOG is ­responsible for the following:

  • Submitting data to ARIS
  • Rectifying and (re)submitting data in case of technical reporting issues between ENTSOG and ARIS

The TSOs are responsible for carrying out the following:

  • Performing complete, high-quality and timely data publications on ENTSOG TP
  • Monitoring information provided by ENTSOG on data reported on TSOs’ behalf to ARIS
  • If ACER rejects TSO REMIT data due to content / ­functional reasons, the respective TSO shall resend the relevant information to the ENTSOG TP. It will then be transmitted to ACER through the ENTSOG Reporting System
TSOs’ Implementation of REMIT

Commission Implementing Regulation (EU) No 1348 / 2014 stipulates that gas TSOs shall report the following disaggregated information per market participant to ACER:

  • Transaction data: natural gas transportation contracts within the Union between two or more locations or bidding zones, concluded as a result of a primary ­explicit capacity allocation by or on behalf of the TSO, specifying physical or financial capacity rights or ­obligations
  • Fundamental data: day-ahead nominations, final ­re-nominations of booked capacities, specifying the identity of the market participants involved, and the ­allocated quantities.

The TSOs reporting obligations under REMIT commenced 7 April 2016.

To facilitate the TSOs’ REMIT implementation processes, ENTSOG has established the following:

  • Regular REMIT panels at Transparency Working Group meetings
  • Biweekly discussion sessions between ENTSOG’s Transparency Team, TSOs and members of ACER’s REMIT Team. The aim is to provide clarity on various technical and policy questions and resolve issues ­related to data reporting. During 2017, ENTSOG

Transparency Team and Transparency Working Group participated in the following events:

  • ACER REMIT Expert Group meetings
  • ACER RRM User Group meetings
  • ACER ENTSOG TSOs biweekly stakeholder webinars
  • ACER public consultation on electronic formats for REMIT reporting
  • 1st ACER REMIT Forum

Activities for Tariff Network Code preparations

The Transparency Area has been following the development of the Tariff Network Code (TAR  NC) closely through ­dedicated updates from the Transparency Working Group meetings. After receiving a positive opinion on the network code in September 2016, ENTSOG decided to establish a joint taskforce between the Transparency and Tariff Working Groups to facilitate the implementation of the transparency requirements laid out in TAR  NC. The taskforce was active throughout the year 2017 and will remain active until the suggestions and possible changes resulting from the ­feedback received during the implementation of the tariff data publication requirements have been analysed and ­implemented.

Annual Public Workshop on Transparency

Part of ENTSOG’s Annual Working Program is to foster ­collaboration with the Energy Communities’ Contracting Parties, and therefore ENTSOG organised the 11th Annual Public Transparency Workshop in collaboration with the ­Energy Community on 6 December 2017 in Vienna. The workshop was organised in two sessions dedicated to the following topics:

  • ENTSOG TP including stakeholder feedback
  • Transparency on Tariffs on ENTSOG’s TP and TSO /NRA websites

As part of the workshop, ENTSOG demonstrated the new functionalities of the Transparency Platform presented a series of video tutorials for selected features.

The videos are available on ENTSOG’s Vimeo channel Stakeholders from REKK and Route 4 Gas shared their user experience and feedback of the TP data and functionalities with the audience.

ACER presented its feedback on the platform and suggested improvements in some functional and data publication areas.

During the session dedicated to publication of tariff information, ENTSOG informed the audience about the publications to be made on the TP and TSOs / NRAs’ websites respectively, the standardised template developed by TSOs, and the Austrian NRA, E-Control, shared their experience with publication of tariffs on their own website.


The aim of the Interoperability team and WG of ENTSOG is to facilitate an appropriate level of harmonisation in technical, operational and communication areas to enable market integration and to facilitate a free flow of gas in Europe.


Group Structure

The Gas Quality (GQ) KG elaborates the long-term gas quality outlook in cooperation with System Development area; supports European standardisation activities in the field of gas quality and monitors the implementation of the relevant provisions of the network code.

The IT and Communications (ITC) KG develops common data exchange solutions and the related communication profiles streamlining communication solutions for data ­exchange.

The Regional Coordination System for Gas (ReCo System) KG supports the different ReCo Teams (North West, East and South) to facilitate regional coordination in case of a gas supply crisis or in emergency situations and is responsible to further develop the ReCo System for Gas.

Gas quality

Cooperation with CEN, JRC and Marcogaz in gas quality harmonisation.

As a continuation of EC M400 mandate to CEN for ­standardisation in the fields of gas qualities and supported by the conclusions of the 29th Madrid forum, CEN ­continues working on finding an EU agreement for a Wobbe Index band, including elaborating on the possibility of regional specific bands.

With that aim, CEN Sector Forum Gas working group ­“Pre-normative study of H-gas quality parameter” is ­conducting a study on the impact of H-gas quality parameters not yet or insufficiently specified in EN16726:2015 (‘Gas infrastructure – Quality of gas – Group H’) on the whole gas supply chain. The analysis will be undertaken on the basis of technical evidence.

As part of the preparatory work, the CEN SFGas WG, in ­cooperation with the Joint Research Centre of the EC, ­arranged a survey to collect Wobbe index and gross ­calorific value measured data from gas system operators and end users. In this context, ENTSOG offered to collect ­input from its members.

The data collected by ENTSOG were presented in a public workshop in September 2017 and summarised in a report, which, besides presenting the data, proposes an analysis methodology with the view of facilitating the choice of ­potential Wobbe Index ranges and related parameters (among others, the variability).

ENTSOG continues cooperating with CEN, JRC and ­Marcogaz (as an observer of the Gas Quality working group) in standardisation developments around natural gas quality, with a special attention to biomethane and hydrogen. ­ENTSOG also keeps an on-going dialogue on gas quality ­issues with all stakeholder organisations along the gas value chain.

Regarding biomethane, the standard EN 16723-2, Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network – Part 2: Automotive ­fuels specification was approved by CEN members in March 2017. Part 2 of this standard complements the already ­approved part 1 (Specifications for biomethane for injection in the natural gas network).

As for hydrogen, CEN has established different working groups both for the standardisation of pure hydrogen ­applications as well as hydrogen and natural gas mixtures. These workstreams are expected also to feedback to the EN16726 standard.

Preparation of Gas Quality Outlook 2018

Following provisions of Article 18 of the INT  NC, ENTSOG is preparing the next edition of the Gas Quality Outlook, which will be published alongside TYNDP 2018. The new edition will include for the first time biomethane as well as revision of the reference gas quality values for different supply ­corridors – which were presented at the Stakeholder Joint Working Session for TYNDP 2018 in December – and a ­reformulation of the gas quality regions.

Frequency distribution of Wobbe index
Wobbe Index

Security of Supply (SoS)

Support to the implementation of the revised SoS ­regulation

The Regional Coordination System for Gas (former Early Warning System) has been functioning and progressing since 2014 and is considered as an important tool in case of any crisis event. In 2016, the Commission proposed a new security-of-supply regulation and ENTSOG was also ­involved in the process.

In 2017 the new Regulation (EU) 2017 / 1938 of the ­European Parliament and of the Council concerning ­measures to safeguard the security of gas supply was ­adopted and published on 25 October 2017, and the ReCo System for Gas got a legal basis and became part of the Regulation. This Regulation foresees that in the event of a regional or Union-wide emergency, the transmission system operators shall cooperate and exchange information using the ReCo System for Gas established by ENTSOG.

Based on ENTSOG’s supply corridor approach, ENTSOG, together with its members, supported the EC regarding the re-composition of the risk groups (Annex I Regulation 2017 / 1938), defined disruptions scenarios in consultation with the Gas Coordination Group for the first Union-wide simulation and suggested to include the Regional ­Coordination System for Gas (ReCo System for Gas) in the new SoS Regulation.

The revised SoS Regulation also foresees new tasks for ­ENTSOG such as the Union-wide simulation of the above-mentioned disruption scenarios and providing the results to MS as the basis for the risk assessments each MS needs to carry out.

ENTSOG’s team continued further close cooperation with the European Commission and the Gas Coordination Group in implementing the new Regulation.

Technical cooperation with Energy Community and third country TSOs

According to Article 8 (3)(c) of Regulation 715 / 2009, ­ENTSOG is in charge of providing “recommendations relating to the coordination of technical cooperation between Community and third-country transmission system ­operators”. In line with this provision, on a yearly basis ­ENTSOG together with the EnC Secretariat organise workshops for TSOs from the Contracting Parties to the EnC as well as other relevant stakeholders.

In 2017, the workshop was held on 9 November at the premises of the EnC Secretariat in Vienna and one of the main topics addressed was an exchange of EU TSOs’ ­experiences in preparing and concluding Interconnection Agreements and providing recommendations to non-EU TSOs in this regard.

Another important topic was the discussion on the European-Wide simulation of disruption scenario (undertaken by ENTSOG in accordance with Regulation 1938 / 2017) and its results, as well as the impact of the Regulation on ­Contracting Parties.

In addition, ENTSOG presented to the participants the way forward in the gas quality harmonisation process, ­challenges around implementation of common units and the updates on implementation data exchange solutions.

ENTSOG’s interoperability team and EnC Secretariat agreed to continue such practice and are open to provide their ­expertise and recommendations on request of other TSOs.

In 2017 ENTSOG cooperated also with Swissgas, inviting them to join the ReCo Team South. ENTSOG continued close cooperation with Gassco, Ukrtransgaz and Swissgas regarding technical cooperation and kept these gas transmission companies informed of coordination procedures in case of crisis events.

SoS and regional cooperation

After the revised SoS Regulation was published all EU TSOs were officially invited by ENTSOG to participate in already established ReCo Teams and ENTSOG expects to complete the teams in 2018. At the end of 2017, 33 TSOs (including 3 TSOs from non-EU countries) were member of at least one of the three ReCo Teams.

Considering preliminary arrangements in 2016 and the ­importance of gas supply to Europe from North African countries, the new ReCo Team South was established in March 2017. It started with eight TSOs from France, Italy, Austria, Switzerland, Portugal, Spain and Slovenia. Enagás (Spain) took over the role of the facilitator for the next two years.

During the cold spell in Europe in February 2017, the ReCo Teams East and North-West successfully got together to discuss the situation in European countries, readiness of TSOs to cope with cold weather and increasing demand. It was considered as a good practice and had positive feedback from participating TSOs.

On 12 and 13 December 2017 two virtual meetings took place as a consequence of the incident at the Baumgarten hub in Austria which caused the disruption of the gas flows from Slovakia to Austria, and from Austria to Hungary, Italy and Slovenia, as well as a need to redirect gas flows in other countries. The European Commission as head of the Gas Coordination Group was informed about the ReCo Team East meeting and the coordination of TSOs during the event.

Regarding other activities of the ReCo Teams in 2017 the ReCo Team East successfully completed an unannounced communication exercise. For the ReCo Teams East and North-West planned communication exercises were carried out on the occasion of the handover of the facilitator role from one TSO to another one and all ReCo Teams agreed on a list of facilitators for the period 2017-2021.

In addition, TSOs were working on how the principles and approaches of the ReCo System for Gas could be considered as a common network operation tool to ensure coordination of network operation in emergency conditions in line with Regulation 715 / 2009 Art. 8 para 3 (a).

Support of the EC in the gas flow monitoring via Ukraine

In line with the provision set out in Regulation (EU) 994 / 2010 Article 11 Para. 7 and Articles 5 and 6 of the “Rules of procedure for the Gas Coordination Group”, the EC ­formally asked ENTSOG for its support in establishing a Ukrainian Monitoring Mission in November 2014. Since then several trilateral talks and meetings have been held ­between Ukrtransgaz, EC and ENTSOG. A daily monitoring report was developed and issued by Ukrtransgaz and is shared with the EC and ENTSOG on a daily basis.

In 2017, Ukrtransgaz was informing the EC and ENTSOG about systematic continuing (since 2016) pressure ­reductions on the border between Ukraine and Russia. Therefore, information about pressure on the border ­between Russia and Ukraine was added to the daily monitoring reports in order to provide a better understanding and assessment of the situation.

In addition, ENTSOG’s representative visited Gazprom’s ­dispatching centre and discussed the position of the ­Russian side in this respect. The European Commission was ­informed about the results of the meeting accordingly.

Data Exchange

Updates of CNOTs

In 2017, ENTSOG continued the improvement of the common network operation tools (CNOTs) with special attention to the communication profiles.

Under the data exchange section of its website, ENTSOG has published or updated the following documents:

  • The Interactive data exchange profile, which provides guidelines mostly about consistency and usability than about technical conformance, as the exchange involves humans and is not completely automated. Among the use cases, the most relevant is perhaps authenticated transactions involving private information, which is applicable to the capacity trading ­process.
  • The integrated data exchange profile. For interoperability and consistency, additional guidelines are required to specify how this data exchange solution, which relies on HTTP / S-SOAP as protocol and Edig@s-XML as format, is to be used. It includes a technical profiling of the use of Web Services. The profile aims to support public, private, anonymous and authenticated access to services in an ­interoperable way.
  • The ENTSOG AS4 usage profile, which provides not only interoperability guidance for the required AS4 ­functionality (i. e., whose requirements are mandatory and are optional) but also security guidance based on state of the art best practices following ENISA ­recommendations.
  • ENTSOG AS4 Configuration Management Approach, which proposes a set of key AS4 data exchange ­configuration parameters that AS4 parties need to ­exchange to set up a successful connection.
  • AS4 Agreements and Agreement Updates, describing how AS4 endpoints can handle certificate renewal in a semi-automatic way.
  • Setting up an AS4 System, which describes the Key steps that organisations need to take to implement AS4.
Follow-up of EASEE-gas developments

ENTSOG cooperates with EASEE-gas in the field of data ­exchange as an observer in the relevant groups.

Functionality issues around data exchange

In December 2017, the first issue was posted on the ACER-ENTSOG functionality platform. The functionality problem described relates to the use of AS4 by Virtual Trading Point and Storage Operators for notification of traded quantities and nomination to storage points respectively.

ENTSOG, in close cooperation with ACER and the relevant stakeholders, are currently analysing the potential solutions for this interoperability question in advance of stakeholder consultation.

Operation of the LIO office

The Energy Identification Codes (EIC), standardised and maintained by ENTSO-E, provides a unique identification of the market participants and other entities active within the European Internal European Energy Market. It is widely used in the Electronic Document Interchange and shall be used to identify parties and objects for REMIT.

ENTSOG continued to operate the LIO Office 21 throughout 2017 and ENTSOG now manage more than 1200 EIC codes on behalf of market participants.

In 2017, ENTSOG attended joint CIO / LIO meetings and contributed to the upgrading of the EIC Reference Manual.