Energy supplier change 2026: new obligations for retailers and distributors

Key data

Energy retailers and distributors operating in the European Union have new technical and procedural obligations since the publication of the Commission Implementing Regulation (EU) 2026/855, on 16 April 2026. The regulation establishes interoperability requirements and non-discriminatory procedures for accessing the data necessary when a customer decides to change supplier.

The impact is direct: if your company distributes or retails energy, you must review your data exchange systems and internal processes. If you do not, you risk regulatory sanctions. If you are a new market entrant, this regulation works in your favor.

What does this regulation establish?

Commission Implementing Regulation (EU) 2026/855 sets out the technical and procedural rules that energy market operators must follow so that supplier switching is real, swift and without discrimination. These are the main pillars of the regulation:

• Technical interoperability requirements: IT systems of distributors and retailers must be capable of exchanging consumption data under common standards defined by the regulation.
• Non-discriminatory procedures: access to the data necessary for supplier switching must be guaranteed on equal terms for all operators, without favoring incumbents over new entrants.
• Transparency in data access: consumption data must be shared in a standardized manner, eliminating information asymmetries that have historically acted as a barrier to entry.
• Customer portability: the regulation seeks to make supplier switching technically smooth, removing obstacles that depended on lack of system compatibility.
• Adaptation of systems and internal processes: affected companies must modify both their technological infrastructure and operational procedures to comply with the new standards.
• Enforcement regime: non-compliance may result in regulatory sanctions applied by the competent national authorities of each Member State.

The regulation has direct implications for retail energy market competition, favoring new entrants and consumers wishing to change provider.

Economic and operational impact

The impact of this regulation is not only technical: it has concrete economic and competitive consequences for different market actors.

For established distributor and retailer companies, the main cost is technological adaptation: reviewing and modifying data exchange systems to comply with the new interoperability standards. Those that do not do so in time risk regulatory sanctions from the competent national authorities.

For new operators, the regulation represents a competitive lever: by removing technical barriers to data access, they can compete on equal terms for customers of large retailers.

Who does it affect?

• Energy retailers: must adapt their systems and processes to share consumption data in a standardized and non-discriminatory manner when a customer requests to change supplier.
• Energy distributors: are obliged to guarantee access to consumption data under the new technical interoperability standards.
• New entrants in the retail energy market: directly benefit from the removal of technical barriers that previously prevented them from accessing potential customer data.
• Consumers wishing to change supplier: the switching process should be faster and more transparent thanks to data standardization.
• Technology and systems managers (CTO, IT) in energy sector companies: are responsible for leading the technical adaptation of data exchange systems.
• Compliance officers in the energy sector: must verify that internal procedures comply with the non-discriminatory and transparent requirements demanded by the regulation.

Practical example

Imagine a mid-sized retailer operating in several regions. Until now, when a customer wanted to switch to a competitor, the process of transferring consumption data could be delayed or present technical incompatibilities that, in practice, discouraged switching.

With Regulation (EU) 2026/855, that retailer is obliged to:

1. Adapt its IT system so that the consumption data of the departing customer is transferred to the new supplier in the standardized format required by the regulation.
2. Ensure that this process is carried out on non-discriminatory terms: that is, with the same speed and data quality as if the customer were staying.
3. Review its internal procedures so that the operational team executes the switch transparently and within the timeframes established by the regulation.

If the retailer does not adapt its systems and a competitor or consumer reports non-compliance, the competent national authority may initiate enforcement proceedings. The cost of non-adaptation may far exceed the cost of technological adaptation.

What should companies do now?

1. Audit current data exchange systems: identify whether the company's IT systems are capable of sharing consumption data in standardized and interoperable formats with other market operators.
2. Review supplier switching procedures: verify that internal processes for managing customer departures to other providers comply with the non-discrimination and transparency requirements demanded by the regulation.
3. Plan technological adaptation: if gaps are identified in current systems, initiate an adaptation project with a clear timeline, before the regulation enters into force.
4. Assign internal responsibility: designate a responsible party (IT, Compliance or both) to coordinate adaptation and monitoring of regulatory compliance.
5. Consult the competent national authority: each Member State has its own energy regulatory authority. Verify if there are technical guides or additional deadlines published at national level.
6. Monitor the entry into force date: the exact date has not been specified in the available text. It is essential to consult the full text in the Official Journal of the EU to know the application deadlines and avoid non-compliance.