What is MaBiS?
MaBiS, the Market Rules for the Implementation of Balancing Group Settlement for Electricity, is a binding set of rules issued by the Federal Network Agency. It defines how balancing-relevant master and transaction data are to be exchanged and settled in the German electricity market. The abbreviation stands for market processes for electricity balancing group accounting and is used as a separate word in everyday language. Since April 1, 2011, all market participants – including grid operators, suppliers, balancing group managers and metering point operators – have had to comply with these rules. The aim is to achieve transparent and standardized balancing group billing. MaBiS means understanding the basics: Electricity is balanced at quarter-hour intervals. All energy quantities fed in and withdrawn are aggregated into so-called total time series. MaBiS defines how these time series are formed, sent and checked so that the balancing group managers have to pay their deviations or receive refunds. The rules seem technocratic, but they create the framework for a fair market. Without MaBiS, there would be no standardized processes for balancing group settlement – deviations could not be settled correctly and the stability of the electricity grid would be at risk. Therefore, balancing group settlement is the foundation for reliable market communication and ensures that all players follow the same rules. Companies that fail to do so risk contractual penalties and reputational damage. The set of rules has a modular structure and has been further developed with MaBiS 2.0 and 3.0 to take account of new requirements such as Market Communication 2022.
Why MaBiS is important for companies
The introduction of balancing group accounting was a milestone for the German electricity market. Previously, there were no standardized specifications on how volume deviations between feed-in and withdrawal are balanced. MaBiS has several advantages for companies:
- Transparent billing: Balancing group deviations are determined according to clearly defined rules and do not cause any surprises. Transparent balancing group settlement increases trust between market partners and facilitates cooperation with the transmission system operators.
- Legal certainty: The Federal Network Agency has defined the MaBiS processes as binding. Anyone who complies with them automatically fulfills key regulatory requirements. This protects against sanctions and minimizes the risk of liability.
- Automated processes: Standardized message formats allow time series to be transmitted and checked automatically. This reduces manual work and sources of error.
- Cost control: MaBiS defines how the balancing energy is calculated. The quarter-hourly reBAP (control area balancing energy price) ensures uniform prices. This enables companies to control their balancing group deviations in a targeted manner and calculate costs more accurately.
- Better planning: Suppliers and balancing group managers know which deadlines apply. There are 34 to 42 working days between the end of the billing month and the invoice; corrections are possible for seven months. This predictability makes cash management easier.
For suppliers and grid operators, this means that they must adapt their systems and processes to the requirements. The set of rules defines how time series are formed and what content they have. At the same time, it creates a framework for automated workflows. Without MaBiS, each market participant would apply its own rules – a nightmare for consistency and fairness. Those who use MaBiS consistently benefit from more efficient processes, reduced errors and better balancing. A standardized process is indispensable, especially in times of increasing complexity due to renewable energies and smart metering systems. MaBiS forms the bridge between regulatory requirements and the economic interests of market participants.
Basic principles of balancing group accounting
Balancing group billing follows a simple logic: feed-in and withdrawal in a balancing group should balance each other out every quarter of an hour. If the balancing group deviates, balancing energy is used. MaBiS defines processes and roles to make this billing fair and transparent. Important roles and their tasks are shown in the following table:
| Role | Task | Responsibility | MaBiS reference |
| Balancing group manager (BKV) | Manages the balancing group, forecasts and reports feed-in and withdrawal quantities | Bears economic responsibility for deviations; must ensure balancing group compliance | Must transmit the total time series to the transmission system operator in accordance with MaBiS and pay the reBAP |
| Transmission system operator (TSO) | Determines the deviations, organizes the physical balancing energy | Issues monthly invoices; calculates the reBAP together with other TSOs | Implements the MaBiS processes and claims balancing energy costs from the BKV |
| Distribution system operator (DSO) | Reports measurement data from the distribution grid (e.g. standard load profiles and meter readings) | Must provide the data in full and on time so that the TSO can aggregate it | Adheres to MaBiS deadlines and delivers correct quantities for balancing group billing |
| Balancing group coordinator (BIKO) | Coordinates balancing group accounting, creates clearing lists | Checks deviations, invoices them and carries out corrective settlements | Ensures that MaBiS requirements are met and that invoices remain traceable |
Processes and deadlines in MaBiS
The defined processes and deadlines are a key component of MaBiS. They specify when which data must be exchanged and how long corrections are possible. After each calendar month, the TSO determines the deviations between the reported and actual energy quantities. This so-called balancing group statement is prepared between the 34th and 42nd working day after the end of the month. The BIKO sends out clearing lists detailing the deviations and the associated costs or refunds. In the case of subsequent correction notifications, a correction statement is issued seven months after the billing month. These long deadlines give market participants planning security, but also require reliable processes.
The process flow is divided into several steps:
- Collect metering data – Metering point operators and distribution grid operators record the energy flows. They use standardized load profiles (SLP) or recording load profile measurements (RLM), depending on which systems are connected. The data is recorded at 15-minute intervals.
- Form time series – The collected measured values are aggregated to form total time series. These time series contain both withdrawal and feed-in data for a balancing group. MaBiS requires that each time series is clearly labeled and given a version so that subsequent changes can be tracked.
- Data transmission – The time series are sent to the TSO via standardized message types (e.g. UTILMD, MSCONS, APERAK). These formats ensure that all necessary information is included. In the event of incorrect data, the TSO sends back an APERAK message with error codes so that the sender can make corrections.
- Deviation analysis – The TSO compares the reported time series with its own load flow calculations. Deviations are recorded in difference time series. The BIKO checks whether deviations are due to forecast errors or measurement errors and creates a clearing list.
- Settlement and corrections – The variances are multiplied by the reBAP. The resulting amount can be positive or negative. The BKV receives the invoice or credit note via the BIKO. If necessary, the BRP can report corrections within seven months. The TSO then carries out a correction settlement.
Each step is precisely defined to avoid misunderstandings. The deadlines may seem long at first glance, but they are necessary to process the large volumes of data. For companies, this means that processes must be automated and monitored. Incomplete or late reports can lead to financial disadvantages. Regular training and professional energy data management help to comply with all MaBiS requirements. The set of rules does not remain static – the Federal Network Agency regularly publishes new versions in order to adapt the requirements for balancing group billing to changing market conditions.
Practical example: Implementation of MaBiS processes
A specific project shows how MaBiS can be successfully implemented. We integrated the MaBiS processes into the existing energy data management system for an energy supplier. The aim was to ensure the automated exchange of messages with market participants and to handle balancing group billing efficiently. The project lasted six months and was based on a three-layer architecture (thin client, application server and MS SQL 2008). The existing business processes were supplemented with MaBiS-specific functions: new data structures for total time series were introduced, tolerance values for deviations were defined and a workflow was developed that decides whether a time series is automatically accepted or rejected. This meant that the user only had to intervene in exceptional cases, which significantly reduced the workload. Our solution enabled the customer to take better commercial responsibility for deviations and use the clearing process efficiently. Close integration with the energy data management system meant that time series could be assigned correctly and the BKV received timely feedback.
The project shows how important a structured approach is: analyzing the initial situation, defining data flows, implementing automated workflows and training employees. It serves as a practical example of how MaBiS can not only be a regulatory obligation, but also a tool for process optimization.
Tips and success factors for implementation
The introduction of MaBiS does not only affect the IT department. It requires organization-wide cooperation and clear responsibilities. The following recommendations have proven themselves in practice:
- Early analysis: Check existing processes and data sources. Determine which systems are involved in balancing group accounting and how they communicate with each other. Identify gaps in the time series and plan how to close them.
- Gradual introduction: Instead of a big-bang approach, pilot projects should be carried out. Start with a sub-area, for example a single balancing group, and expand after a successful introduction.
- Use automation: Standardized formats and interfaces enable a high degree of automation. Rely on tools that generate and process MaBiS-compliantmessages. Automatic plausibility checks reduce manual effort.
- Integrate specialist departments: Energy data management, controlling and sales must work together. The rules can only be applied correctly if everyone involved understands them. Training and regular coordination are important.
- Continuous improvement: MaBiS is being further developed. Keep your systems up to date and check new versions in good time. Regular benchmarks help you to evaluate and improve your own accounting quality.
Important note: The billing of balancing energy is based on the reBAP, which is determined for each quarter of an hour. Even small forecasting errors can cause considerable costs with high loads. It is worth building up a flexible portfolio of controllable systems and storage facilities. This allows you to react actively to deviations and act in accordance with MaBiS.
These success factors show: The implementation of MaBiS is not just an IT project. It requires an interplay of technology, organization and processes. Companies that prepare early on benefit from stable balancing group accounting, lower risks and more transparent processes. Well thought-out change management helps to involve employees and create acceptance. Ultimately, MaBiS is not an end in itself, but a tool to make the energy market more efficient and fairer. The investment in know-how, systems and cooperation pays off in the long term because it lays the foundation for future regulatory requirements.
Current developments: The path to the MaBiS hub
Since 2024, the Federal Network Agency has been working on a far-reaching modernization of the market rules for balancing group billing. The MaBiS hub is being prepared in a process launched in October 2024 to determine the future aggregation and billing of balancing-relevant data. The aim of this reform is to process metering and load profile data pseudonymously from 2030 at the latest and to replace the previously decentralized processes of balancing group billing with a central platform. This should improve data protection, data quality and efficiency and noticeably reduce the burden on market partners.
The process is divided into two blocks: The focus point “Measured value processing and pseudonymization (BK6-24-210-1)” develops processes in which measured values are only processed using MaLo IDs or other pseudonyms in order to meet the data protection requirements of the Metering Point Operation Act. The second focus area “Balancing and balancing group billing (BK6-24-210-2)” is dedicated to future balancing and billing and defines new standards for summation, difference and balancing group time series. Both blocks will be adopted one after the other to enable a staggered introduction.
The core of the reform is the centralization of balancing group settlement. The MaBiS hub is to be operated uniformly throughout Germany – presumably by a consortium of transmission system operators – and take over the aggregation of the total time series as a “single point of truth”. Market roles such as metering point operators, balancing group managers and grid operators will continue to supply their metering data, but will hand over a large part of their current manual checking and aggregation tasks to the hub. Distribution system operators no longer need their own EDM systems for balancing; this is explicitly mentioned in the specification as a cost advantage, as local systems are no longer required for balancing.
Implementation will take place in stages: After completion of the first specification for metered value processing, which the Federal Network Agency is targeting for 2026, the hub is to go into operation in the second half of 2028. All market participants will have to implement pseudonymized processing by 2030 at the latest. Companies should therefore modernize their IT systems early on, test interfaces to the hub and train their employees.
A paradigm shift is therefore on the horizon for balancing group management in 2026. In conjunction with the MaBiS 3.0 processes, the requirements of Redispatch 2.0 and the new standard balancing group contract, automated forecasting and billing systems, digital platforms for secure market communication and high forecast quality will become indispensable. Incorrect forecasts will become significantly more expensive in centralized billing, making investments in modern data analyses and flexible systems worthwhile. MaBiS is thus transforming from a purely regulatory framework into a central component of the digital strategy in the energy market: those who prepare early will take advantage of the opportunities offered by the new infrastructure and avoid additional costs later on.
FAQs
What is MaBiS and how does it differ from balancing group billing?
MaBiS refers to the set of rules that defines the processes and data flows for balancing group settlement in the German electricity market. Balancing group settlement itself is the monthly process in which feed-ins and withdrawals in a balancing group are balanced and settled. Without MaBiS, there would be no standardized framework for this process. In practice, MaBiS ensures that all market participants use the same message formats and deadlines and form their time series correctly. Balancing group settlement is therefore part of the MaBiS processes and is structured and made transparent by them.
Who is affected by MaBiS and what role do the stakeholders play?
MaBiS affects all companies that participate in the electricity market. These include balancing group managers (BKV), who manage their balancing groups; transmission system operators (ÜNB), who determine deviations and provide balancing energy; distribution system operators (VNB), who supply metering data and standard load profiles; and the balancing group coordinator (BIKO), who coordinates billing. Suppliers and metering point operators must also comply with the specifications. MaBiS defines tasks and deadlines for each role so that the data flow functions smoothly. Companies that do not adapt their processes to MaBiS risk billing errors or contractual penalties.
What data is transmitted as part of MaBiS?
The most important data basis are total time series for feed-in and withdrawal. They are formed from quarter-hourly measurements by grid operators and metering point operators. MaBiS distinguishes between total time series (SumZ) for balancing groups, difference time series (DZR) for deviations and balancing group settlement balances (BAS) for the result. All time series receive version numbers and are transmitted in standardized EDIFACT messages such as MSCONS, UTILMD or APERAK. In addition, clearing lists are created that disclose the deviations and costs to the BKV. This structured data transmission enables transparent balancing group billing.
How does MaBiS affect a company’s costs?
MaBiS regulates the calculation of balancing energy and thus the costs for balancing group deviations. Deviations are multiplied by the reBAP – a uniform price per quarter of an hour. Those who improve their forecasts and keep the balancing group in balance reduce their balancing energy costs. At the same time, MaBiS uses clear processes to prevent unnecessary penalties, for example if time series are reported too late or incorrectly. Companies can also reduce their costs through automation: if time series are checked and sent automatically, the effort required for manual corrections is reduced. MaBiS therefore offers both cost transparency and savings potential.
How can companies react to changes in MaBiS?
The Federal Network Agency is continuously developing MaBiS. Changes often concern new data formats or deadlines. Companies should therefore establish active monitoring and update their systems regularly. Training for employees and close coordination between departments help to adapt new versions quickly. Many market partners use benchmarks or consulting services to check their accounting quality and identify improvements. It is important to ensure compliance with the current set of rules for each adaptation in order to guarantee proper balancing group accounting.
