AS4 compliant – deadline approaching for German TSO’s


The EU regulation 2015/703 of 30 April 2015 established a network code on interoperability and data exchange rules. The regulation took effect on 1st of May 2016. According to Article 21 of the regulation, German TSOs must switch the document-based data at cross border and market area interconnection points to the communication protocol AS4 and Edig@s-XML data format.

The decision of the Bundesnetzagentur (12th of April 2016) concerning the request by German TSOs to approve the further usage of existing solutions for data exchange, allowed Gasunie Deutschland (GUD) to utilize the already established AS2 protocol in conjunction with EDIFACT formats until 31th of January 2018. GUD will use this exemption until 1st of October 2017.

AS4 is to deemed to be implemented before 1st of October 2017 and this affects a high number of market parties. The switching requires a detailed planning and will take a period of approximately one year.

Who is affected by AS4?

Alle market parties who nominate, get matched or obtain capacity stock reports at cross border and market area interconnection points.

Which functionalities has AS4?

AS4 has the following functionalities:

  • Acknowledge mechanisms, a reliable messaging and – in case of erroneous data transmission – the ability to allow repeat.
  • Secure data exchange via password authentication, digital signature and encryption.
  • Compression and transmission of large volumes of data.
  • Pattern for message exchanges that allows a rich variety of interactions between sender and receiver.

What are the differences between AS4 and AS2?

AS4 is in many ways similar to AS2, but works in a web services context. AS4 allows advanced interaction patterns and receipts for message-based transfer of data.