The customer and developer services measures of experience: C-MeX and D-MeX
Customer service is one of the four key themes of our 2019 price review (PR19). Providing a truly excellent customer experience for customers is fundamental for maintaining trust and confidence in the water sector.
As part of PR19, we are introducing the customer measure of experience (C-MeX) and developer services measure of experience (D-MeX). C-MeX and D-MeX are financial and reputational incentive mechanisms designed to provide customers in the water sector with excellent levels of service. They will be effective from 1 April 2020, when they will replace the service incentive mechanism (SIM), which has been in place since 2010. During 2019-20, C-MeX and D-MeX will be run in shadow form.
We set out these decisions in our PR19 final methodology. For more information about the background and design of C-MeX and D-MeX see Final methodology: appendix 3 (customer measure of experience and developer measure of experience)
This webpage provides a brief introduction to C-MeX and D-MeX as well as links to key documents.
The following links will take you to pages containing more detail around specific areas of the C-MeX and D-MeX development:
The customer measure of experience (C-MeX) is a mechanism that will incentivise water companies to provide an excellent customer experience for residential customers, across both the retail and wholesale parts of the value chain.
The developer services measure of experience (D-MeX) is a mechanism to incentivise water companies to provide an excellent customer experience for developer services (new connections) customers. These customers include small and large property developers, self-lay providers (SLPs), and those with new appointments and variations (NAVs).
Shadow year policy documents
These documents, published 8 March 2019, set out our decisions for the shadow year of C-MeX and D-MeX, which runs from 1 May 2019 – 31 March 2020: C-MeX Policy document and D-MeX Policy document.
Our decisions are supported by recommendations from the agents we appointed to pilot these incentives in 2018-19, and the stakeholder representations from the C-MeX and D-MeX working groups and sub-groups. Further information about the pilot can be found on this page.
These policy documents are accompanied by the following guidance for companies.
- C-MeX guidance for the shadow year (March 2019): The objectives of this guidance are to support water companies in providing the necessary information to achieve an accurate and representative set of C-MeX results.
- D-MeX guidance for the shadow year (March 2019): The objectives of this guidance are to support water companies in providing the necessary information to achieve an accurate and representative set of D-MeX results.
- Appendix 3 of December 2017 Methodology
- Working group slides published as part of the final methodology
- Appendix 2 of the draft methodology on outcomes
- November 2016 outcomes consultation (includes link to Economic Insight report on Future SIM)
- SIM section and SIM guidance