Scope and schedule for the May release 2027 adopted

The scope and schedule for the May release 2027 were adopted at the most recent GMM MFF on Wednesday 1 July. Seven topics will go live (technically) on 30 April 2027. Four of these topics relate to metering processes for large electricity connections. These will primarily affect metering responsible parties, system operators and suppliers. The remaining three topics cover various other subjects.

Topics for the May release 2027

• TS013A ‘Vertaalslag van meetgegevens naar allocatiepunt en/of overdrachtspunt (deel A)’ (‘Translation of metering data to allocation point and/or transfer point (Part A)’)
  

This topic describes, for each technical situation, the calculation rules for aggregating metering data from the meter to metering data for the connection’s allocation point or transfer point. Metering responsible parties apply these calculation rules not only to all new large electricity connections, but also to existing connections, of which the technical situation is set out in a so-called principle diagram (see topic TS013B).

• TS013B ‘Vertaalslag van meetgegevens naar allocatiepunt en/of overdrachtspunt (deel B)’ (‘Translation of metering data to allocation point and/or transfer point (Part B)’)

This topic describes the agreements for recording the technical situation at a connection in what are known as schematic diagrams. Connected parties are responsible for supplying such a schematic diagram to system operators and metering responsible parties. This applies to new connections that deviate from the standard situation, as well as to existing connections at a number of specific points in time described in the topic document. At the request of a connected party, the system operator may assist in drawing up the schematic diagram. The metering authority will be involved where necessary.

• TS066 ‘OVP-volumes per overdrachtspunt’ (‘ISP volumes per transfer point’)

This topic sets out arrangements for sharing volumes per imbalance settlement period (ISP) per transfer point. This is relevant for large electricity connections where the allocation point(s) and transfer point(s) do not coincide. The topic describes how metering responsible parties exchange these volumes with system operators on a daily and monthly basis.

• TS080 ‘OVP-volumes grote aansluitingen delen met leverancier’ (‘Sharing ISP volumes for large connections with the supplier’)

This topic sets out arrangements for sharing volumes per ISP with suppliers. This information is becoming increasingly important for accurate billing and market settlement. From the May release 2027 onwards, metering responsible parties will share this information with suppliers on a monthly basis.

• TS065B ‘Vereenvoudiging communicatie nettarieven kleinverbruik (deel B)’ (‘Simplification of communication regarding grid tariffs for small consumption (Part B)’)

Part A of this topic has been live since October 2025. Under Part B, the Berichtenbox (Message Box) will be used as a new channel for notifying suppliers that new grid tariffs are available, and for suppliers to submit a ‘disagree’ response.

• TS072 ‘Registratieproces submeetverantwoordelijken’ (‘Registration process for sub-metering responsible parties’)

This topic concerns the registration of the new market role of sub-metering responsible party. Further arrangements regarding access to data exchange have not yet been finalised for this role. This topic is therefore limited to explaining how to register as a sub-metering responsible party via Het Normo. Further (technical) onboarding is not within the scope.

• MB001 ‘Modernisering berichtstroom TMR’ (‘Modernisation of TMR message flow’)

Two messages used to consult the Accessible Measurement Register (TMR) are being modernised. Suppliers must transition to these new messages during a dual-phase period. The end of this dual-phase period has provisionally been set for 1 January 2028.

Energy Act Metering Regulations postponed: what is the impact?

Shortly after the release was adopted, it was announced that the Energy Act Metering Regulation (also known as ‘MR Meten’) is being postponed. The consequences of this are currently being investigated. There may be an impact on the implementation of topics TS013A and TS066. If the scope of the May release 2027 changes as a result, a decision will be taken via the change process.

More about the May release 2027

Further information and up-to-date documentation for this release can be found on the May release 2027 page on the Energiedatawijzer.

Receive automatic updates on the May release 2027

Keep a close eye on the May release. Via the Energiedatawijzer, you will receive weekly updates whenever there are new publications.