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Please note: The algorithm descriptions in English have been automatically translated. Errors may have been introduced in this process. For the original descriptions, go to the Dutch version of the Algorithm Register.

Detection algorithm Unreasonable Energy Tariffs

Consumer and Market Authority

This algorithm concerns a methodology to detect potentially unreasonable supply tariffs of energy suppliers. The supervisory board can use it to determine whether further investigation is needed. The tariff of an energy product may be unreasonable if it is much higher than the tariffs of comparable energy products.

Last change on 29th of July 2025, at 11:25 (CET) | Publication Standard 1.0
Publication category
Other algorithms
Impact assessment
Field not filled in.
Status
In use

General information

Theme

Economy

Begin date

2024-01

Contact information

info@acm.nl

Link to publication website

Bevoegdheden | ACM

Responsible use

Goal and impact

This algorithm is designed to detect potentially unreasonable supply tariffs of energy suppliers. These can then be investigated further by the supervisory board. The tariff of an energy product is potentially unreasonable if it is clearly higher than the tariffs of comparable products. If there is sufficient reason, the ACM asks the licence holder to adjust the tariff to the standard for that product group.

Considerations

By using the algorithm, it is possible to compare all the different products offered by Electricity and Gas suppliers. Without the algorithm, it would not be possible to carry out this monitoring task with the time that can be spent on it.

Human intervention

If a tariff for a product seems unreasonable compared to other products in the same product group, the calculation is checked. If the outcome is correct, the ACM will contact the licensed party to discuss how this tariff came about.

Risk management

The results are first checked manually by the investigation team before the ACM contacts the licensed party.

Operations

Data

Actual supply tariffs for various products from licensed energy suppliers.

Technical design

The methodology calculates 'outliers' (salient tariffs) based on the interquartile range (IQR) of a set of tariffs with similar characteristics in a given period. For example, all variable energy supplier tariffs that were valid in the market in July 2025.

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