GPKE and feed-in processes: integrating the MPES processes in 2025

GPKE and MPES: two rulebooks become one

Until June 2025 there were two separate worlds. The GPKE governed the supply of consumers, the MPES governed the processes around generation plants. That split now ends, and the two rulebooks become one.

The GPKE, the business processes for the supply of electricity, has long governed the consumption side. It defines the supplier switch, the registration and deregistration, the master data and the market communication that go with the delivery of electricity to a consumption point. For years it was the central rulebook of the German electricity market communication, but only for consumption points, not for generation.

The MPES, the market processes for feed-in points, were the separate rulebook for the generation side. They covered the same kinds of process, supplier switch, registration and master data, but for generation plants and direct marketing, most recently on the basis of the BK6-20-160 ruling, which was valid until 5 June 2025. So a market participant active on both sides had to operate two parallel sets of rules.

Two rulebooks meant double maintenance. Companies had to keep two process worlds, often two IT setups and two sets of special cases, even though many of the underlying steps were similar. The aim of merging the MPES into the GPKE is harmonisation: one rulebook for both consumption and feed-in, fewer parallel structures and less complexity in the long run.

What happens on 6 June 2025

The effective date is the same one that brings the 24-hour supplier switch. The separate MPES rules are repealed and their content moves into the GPKE, driven by two parallel proceedings at the Federal Network Agency (BNetzA).

The integration is effective from 6 June 2025, postponed from the original date of 4 April 2025. From that day the separate MPES rules are no longer in force, and the feed-in processes that they used to govern run within the GPKE. The end of the MPES is not a soft transition but a clean cut-off: the old BK6-20-160 ruling runs only until 5 June 2025, and the new GPKE world starts the next day.

The MPES content is transferred under the LFW24 ruling BK6-22-024, which is set out in Notice No. 4 of 6 December 2024. This is the same ruling that anchors the 24-hour supplier switch on the consumption side, so the feed-in integration and the faster switch sit in one rule package with one effective date. That is why the two changes share the same deadline and why companies should plan them together.

Alongside it runs a second, parallel proceeding, BK6-24-174. It brings the new GPKE reading versions and the metered-load-profile transmission under the MsbG, the metering point operation act, to the same 6 June 2025 date. It is worth being clear about this: these are two parallel BNetzA proceedings pointing at one effective date. BK6-22-024 carries the LFW24 logic and the MPES transfer, BK6-24-174 carries the restructured GPKE reading versions and the metering side, and only together do they describe the full picture of what changes on 6 June 2025.

From feed-in point to generating metering point

One term disappears and a new one arrives. The feed-in point becomes the generating metering point, and that is more than a rename.

Under the MPES the unit of process was the feed-in point. In the GPKE this is replaced by the generating metering point, the counterpart on the generation side to the metering point on the consumption side. The shift in term aligns the generation side with the metering-point logic that the GPKE already uses, so both consumption and generation are described in the same vocabulary.

The new term is also broader than the old one. The generating metering point captures generation that does not feed directly into a public grid, for example plants behind a customer connection or in a closed network. Where the feed-in point was tied to the act of feeding into the public grid, the generating metering point is tied to the act of generating, which fits the way modern plants and self-consumption setups actually work.

As a metering point in the GPKE, the generating metering point becomes the reference point for the core processes: the supplier switch, the registration and the master data on the generation side all hang off it. It is tied to the Market Master Data Register (MaStR), which holds over 3 million generation plants, so the register and the process world are anchored to the same identity for each plant.

The new GPKE structure in four parts

The GPKE is recut. Instead of separate process lists for consumption and feed-in, there are now four shared parts that apply to both worlds.

The restructuring is what makes the merger work in practice. Rather than bolting the old MPES processes onto the side of the GPKE, the BNetzA reorganises the GPKE into four parts that each cover a class of process and apply equally to consumption and generating metering points. The four parts are:

• Part 1, introduction: the introductory process description that sets out scope, terms and how the rest of the document is read.
• Part 2, assignment processes: the assignment processes such as supply start, supply end and supplier switch, the core of who supplies a metering point.
• Part 3, configurations and control commands: the configurations and the control commands that describe how a metering point is set up and steered.
• Part 4, master data processes: the master data processes that keep the data of the metering point correct and synchronised between market participants.

Because the four parts are shared, a process such as the supplier switch is now described once and read the same way for a consumption point and a generating metering point. That is the structural pay-off of the merger: the feed-in side stops being a separate annex and becomes part of the same body of rules, which is also why the master data migration in Part 4 matters so much for the generation side.

What changes for direct marketers and plant operators

For the feed-in side this is the biggest change in years. Direct marketers and plant operators have to move their processes and data into the GPKE logic.

The direct marketer becomes a market role within the GPKE processes for generating metering points. Where the MPES described the direct marketer in its own terms, the GPKE now carries the role directly, so the direct marketer takes part in the standard process world rather than a separate one. The supplier switch, the registration and deregistration and the master data all follow the same GPKE mechanisms that already apply at consumption points, which means the generation side inherits a process logic that many teams already know from the supply side.

On the technical side, two things change at once from 6 June 2025. There is a new MaLo identification process via API, the process of identifying the metering point through an interface rather than the older message paths, and there are new EDIFACT formats for the messages themselves. Direct marketers and plant operators therefore have to adapt both the channel and the formats, which is why this overlaps so directly with the wider format and channel shift in market communication.

The largest single task is the master data migration. The master data that used to live under the MPES has to be moved into the new master-data logic in Part 4 of the GPKE. This is not a one-time export but a mapping of the old fields and identities onto the new structure, so that each generating metering point carries correct and complete master data on day one of the new rulebook. Getting this migration right is what decides whether the switch and registration processes run cleanly afterwards or generate clearing effort.

What companies should do now

Whoever moves the feed-in side into the GPKE world early avoids process errors and clearing effort later. The master data migration and the API connection are the largest pieces, and they line up with the wider market-communication shift set out in the EDIFACT to API migration and with the remote-control duties in the direct marketing and remote control over the smart meter gateway article.

• Clarify the case-reference mapping of the GPKE parts. Map which content sits in BK6-22-024 and which in BK6-24-174, document the four GPKE parts internally, and make sure the teams know which case reference governs which process.
• Inventory and migrate the generation master data. List the existing MPES master data for every generating metering point and migrate it onto the GPKE master-data logic in Part 4, so each plant carries correct data from the start.
• Move direct-marketer processes into the GPKE role model. Take the direct marketer into the GPKE role model for supplier switch, registration and master data, and test the new MaLo identification via API and the new EDIFACT formats before the cut-off. The metering-side shift on consumption is the related change in ZSG quarter-hour balancing.
• Train the market-communication teams. Bring the teams onto the shared consumption and generation rulebook, so the people running the messages understand that feed-in and consumption now follow the same GPKE logic.

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