Investigation into whether Thames Water is contravening the Competition Act 1998

Case summary

We are investigating allegations that Thames Water Utilities Limited has contravened the prohibition in Chapter II of the Competition Act 1998 (“the Act”) by abusing a dominant position. The allegations relate to:

  • the approach that Thames Water has taken when installing digital smart meters and the impact that this has had on providers of data logging services and their customers
  • the accuracy of the data about customers that Thames Water made available to retailers at the time of the opening of the business retail market
  • the fairness of certain contractual credit terms that Thames Water applies to retailers

Date opened

21 June 2019

Relevant powers

Chapter II of the Act




We opened this case after carrying out a preliminary assessment of the complaint and having given consideration to our prioritisation principles.

We have sought and obtained agreement from the Competition and Markets Authority that it is appropriate for us to exercise our concurrent functions under the Act to investigate the allegations.

We will gather information from a number of parties and assess this with a view to identifying whether Thames Water has abused a dominant position.

Further details on the processes that we will follow can be found in our guidance on the application of the Act to the water and wastewater sector.


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